Lots-of-LoRAs/task1422_mathqa_physics huggingface dataset:
Input: Problem: tom , working alone , can paint a room in 12 hours . peter and john , working independently , can paint the same room in 6 hours and 2 hours , respectively . tom starts painting the room and works on his own for two hour . he is then joined by peter and they work together for two hour . finally , john joins them and the three of them work together to finish the room , each one working at his respective rate . what fraction of the whole job was done by peter ? 
Options: a ) 5 / 3 , b ) 1 / 3 , c ) 7 / 3 , d ) 4 / 9 , e ) 3 / 5
Output: d
Input: Problem: a cistern 8 m long and 6 m wide contains water up to a breadth of 1 m 85 cm . find the total area of the wet surface . 
Options: a ) 102 m sqaure , b ) 100 m sqaure , c ) 152 m sqaure , d ) 164 m sqaure , e ) none of these
Output: b
Input: Problem: a train 100 meters long completely crosses a 300 meters long bridge in 12 seconds . what is the speed of the train is ? 
Options: a ) 32 kmph , b ) 76 kmph , c ) 120 kmph , d ) 43 kmph , e ) 40 kmph
Output: c
Input: Problem: it costs $ 6 for the first 1 / 4 hour to use the copier at kinkos . after the first ¼ hour it costs $ 8 per hour . if a certain customer uses the copier for 4 hours and 25 minutes , how much will it cost him ? 
Options: a ) $ 23.45 , b ) $ 65.33 , c ) $ 40 , d ) $ 38.27 , e ) $ 39.33
Output: e
Input: Problem: a train , 120 meters long travels at a speed of 45 km / hr crosses a bridge in 30 seconds . the length of the bridge is 
Options: a ) 270 m , b ) 255 m , c ) 235 m , d ) 220 m , e ) 240 m
Output: b
Input: Problem: pipe a can fill a tank in 24 minutes . pipe b can fill the same tank 6 times faster than pipe a . if both the pipes are connected to the tank so that they fill the tank simultaneously , how long will it take for the empty tank to overflow ? 
Options: a ) 4 minutes , b ) 32 / 7 minutes , c ) 192 / 7 minutes , d ) 3 minutes , e ) 28 minutes
Output: d
Input: Problem: joe needs to paint all the airplane hangars at the airport , so he buys 360 gallons of paint to do the job . during the first week , he uses 1 / 4 of all the paint . during the second week , he uses 1 / 7 of the remaining paint . how many gallons of paint has joe used ? 
Options: a ) 18 , b ) 128 , c ) 175 , d ) 216 , e ) 250
Output: b
Input: Problem: a train moves with a speed of 162 kmph . its speed in metres per second is 
Options: a ) 10.8 , b ) 18 , c ) 30 , d ) 38.8 , e ) 45
Output: e
Input: Problem: david works at a science lab that conducts experiments on bacteria . the population of the bacteria multiplies at a constant rate , and his job is to notate the population of a certain group of bacteria each hour . at 1 p . m . on a certain day , he noted that the population was 2,500 and then he left the lab . he returned in time to take a reading at 4 p . m . , by which point the population had grown to 160,000 . now he has to fill in the missing data for 2 p . m . and 3 p . m . what was the population at 3 p . m . ? 
Options: a ) 45,000 , b ) 40,000 , c ) 50,000 , d ) 55,000 , e ) 60,000
Output: b
Input: Problem: a and b together can complete a piece of work in 4 days . if a alone can complete the same work in 12 days , in how many days can b alone complete that work ? 
Options: a ) 5 , b ) 7 , c ) 6 , d ) 4 , e ) 8
Output: c
Input: Problem: a student traveled 30 percent of the distance of the trip alone , continued another 20 miles with a friend , and then finished the last half of the trip alone . how many miles long was the trip ? 
Options: a ) 240 , b ) 200 , c ) 160 , d ) 100 , e ) 50
Output: d
Input: Problem: at a loading dock , each worker on the night crew loaded 1 / 2 as many boxes as each worker on the day crew . if the night crew has 4 / 5 as many workers as the day crew , what fraction of all the boxes loaded by the two crews did the day crew load ? 
Options: a ) 1 / 2 , b ) 2 / 5 , c ) 3 / 5 , d ) 4 / 5 , e ) 5 / 7
Output: e
Input: Problem: x can finish a work in 20 days . y can finish the same work in 15 days . yworked for 9 days and left the job . how many days does x alone need to finish the remaining work ? 
Options: a ) 3 , b ) 5 , c ) 6 , d ) 8 , e ) 9
Output: d
Input: Problem: a and b together can do a piece of work in 10 days . b alone can finish it in 20 days . in how many days can a alone finish the work ? 
Options: a ) 20 , b ) 10 , c ) 15 , d ) 5 , e ) 7
Output: a
Input: Problem: a cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours . if both the taps are opened simultaneously , then after how much time will the cistern get filled ? 
Options: a ) 2.9 hrs , b ) 8.9 hrs , c ) 2.9 hrs , d ) 7.2 hrs , e ) 8.6 hrs
Output: d
Input: Problem: a man sitting in a train which is traveling at 60 kmph observes that a goods train , traveling in opposite direction , takes 9 seconds to pass him . if the goods train is 280 m long , find its speed . ? 
Options: a ) 52 kmph , b ) 58 kmph , c ) 62 kmph , d ) 65 kmph , e ) 75 kmph
Output: a
Input: Problem: working together , tim and tom can type 12 pages in one hour . if they would be able to type 15 pages in one hour if tom increases his typing speed by 30 % , what is the ratio of tom ' s normal typing speed to that of tim ? 
Options: a ) 1 / 5 , b ) 5 / 1 , c ) 4 / 1 , d ) 1 / 4 , e ) 1 / 3
Output: b
Input: Problem: a man can row 8 kmph in still water . when the river is running at 1.2 kmph , it takes him 1 hour to row to a place and back . what is the total distance traveled by the man ? 
Options: a ) 7.82 km , b ) 6 km , c ) 5.76 km , d ) 5.66 km , e ) 10 km
Output: a
Input: Problem: two trains , one from howrah to patna and the other from patna to howrah , start simultaneously . after they meet , the trains reach their destinations after 9 hours and 25 hours respectively . the ratio of their speeds is ? 
Options: a ) 4 : 5 , b ) 5 : 3 , c ) 4 : 4 , d ) 4 : 8 , e ) 4 : 1
Output: b
Input: Problem: two trains 121 meters and 153 meters in length respectively are running in opposite directions , one at the rate of 80 km and the other at the rate of 65 kmph . in what time will they be completely clear of each other from the moment they meet ? 
Options: a ) 7.19 , b ) 6.8 , c ) 7.2 , d ) 7.15 , e ) 7.11
Output: b
Input: Problem: nd the area of trapezium whose parallel sides are 20 cm and 18 cm long , and the distance between them is 12 cm ? 
Options: a ) 243 cm 2 , b ) 239 cm 2 , c ) 267 cm 2 , d ) 230 cm 2 , e ) 228 cm 2
Output: e
Input: Problem: a and b can finish a work in 10 days while b and c can do it in 18 days . a started the work , worked for 5 days , then b worked for 10 days and the remaining work was finished by c in 15 days . in how many days could c alone have finished the whole work ? 
Options: a ) 30 days , b ) 15 days , c ) 45 days , d ) 24 days , e ) none of these
Output: c
Input: Problem: a light flashes every 15 seconds , how many times will it flash in ? of an hour ? 
Options: a ) 550 , b ) 600 , c ) 240 , d ) 700 , e ) 750
Output: c
Input: Problem: the population of a bacteria colony doubles every day . if it was started 3 days ago with 3 bacteria and each bacteria lives for 12 days , how large is the colony today ? 
Options: a ) 512 , b ) 1024 , c ) 768 , d ) 2048 , e ) 4096
Output: b
Input: Problem: an electric pump can fill a tank in 3 hours . because of a leak in the tank , it took 3 hours 30 min to fill the tank . in what time the leak can drain out all the water of the tank and will make tank empty ? 
Options: a ) 10 hours , b ) 13 hours , c ) 17 hours , d ) 21 hours , e ) 25 hours
Output: d
Input: Problem: express a speed of 72 kmph in meters per second ? 
Options: a ) 10 mps , b ) 76 mps , c ) 20 mps , d ) 97 mps , e ) 16 mps
Output: c
Input: Problem: bruce and anne can clean their house in 4 hours working together at their respective constant rates . if anne ’ s speed were doubled , they could clean their house in 3 hours working at their respective rates . how many q hours does it currently take anne to clean the house on her own ? 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 12 , e ) 14
Output: d
Input: Problem: a train speeds past a pole in 25 seconds and a platform 200 m long in 30 seconds . its length is : 
Options: a ) 1200 m , b ) 2000 m , c ) 1500 m , d ) 1000 m , e ) 4000 m
Output: d
Input: Problem: a contractor undertakes to built a walls in 50 days . he employs 60 peoples for the same . however after 25 days he finds that only 40 % of the work is complete . how many more man need to be employed to complete the work in time ? 
Options: a ) 25 , b ) 90 , c ) 35 , d ) 20 , e ) none of these
Output: b
Input: Problem: a train passes a station platform in 36 sec and a man standing on the platform in 23 sec . if the speed of the train is 54 km / hr . what is the length of the platform ? 
Options: a ) 288 , b ) 195 , c ) 881 , d ) 1277 , e ) 121
Output: b
Input: Problem: two trains of length 100 m and 220 m are running towards each other on parallel lines at 42 kmph and 30 kmph respectively . in what time will they be clear of each other from the moment they meet ? 
Options: a ) 18 sec , b ) 70 sec , c ) 21 sec , d ) 20 sec , e ) 16 sec
Output: e
Input: Problem: maxwell leaves his home and walks toward brad ' s house at the same time that brad leaves his home and runs toward maxwell ' s house . if the distance between their homes is 80 kilometers , maxwell ' s walking speed is 4 km / h , and brad ' s running speed is 6 km / h , what is the distance traveled by brad ? 
Options: a ) 16 , b ) 18 , c ) 40 , d ) 24 , e ) 30
Output: c
Input: Problem: find avrg speed if a man travels at speed of 32 km / hr up and 48 km / hr dawn at an altitude of 230 m . 
Options: a ) 25.8 , b ) 26.8 , c ) 38.4 , d ) 34.4 , e ) 29.8
Output: c
Input: Problem: convert 0.35 in to a vulgar fraction ? 
Options: a ) 18 / 50 , b ) 16 / 50 , c ) 7 / 20 , d ) 19 / 50 , e ) none
Output: c
Input: Problem: two clocks are set correctly at 1 0 ' clock in the afternoon . one keeps correct time . the other gains 5 seconds per minute . that evening , when the fast clock shows 6 : 20 , what does the correct clock show ? 
Options: a ) 4.0 , b ) 5.0 , c ) 6.0 , d ) 7.2 , e ) 3.5
Output: c
Input: Problem: a water tank is one - fifth full . pipe a can fill a tank in 15 minutes and pipe b can empty it in 6 minutes . if both the pipes are open , how many minutes will it take to empty or fill the tank completely ? 
Options: a ) 2 , b ) 4 , c ) 6 , d ) 8 , e ) 10
Output: a
Input: Problem: a can do a piece of work in 12 days . he worked for 15 days and then b completed the remaining work in 10 days . both of them together will finish it in . 
Options: a ) 12 1 / 2 days , b ) 10 1 / 2 days , c ) 12 1 / 3 days , d ) 10 1 / 3 days , e ) 11 1 / 2 days
Output: a
Input: Problem: if a man walks at a rate of 10 kmph , he misses a train by 14 minutes . however , if he walks at the rate of 12 kmph , he reaches the station 10 minutes before the arrival of the train . find the distance covered by him to reach the station . 
Options: a ) 6 , b ) 15 , c ) 12 , d ) 4 , e ) 8
Output: a
Input: Problem: a car travels at a speed of 12 miles per hour . how far will it travel in 5 hours ? 
Options: a ) 50 miles , b ) 60 miles , c ) 72 miles , d ) 22 miles , e ) 62 miles
Output: b
Input: Problem: two trains are moving in opposite directions at 60 km / hr and 90 km / hr . their lengths are 1.10 km and 0.15 km respectively . the time taken by the slower train to cross the faster train in seconds is ? 
Options: a ) 65 sec , b ) 30 sec , c ) 48 sec , d ) 33 sec , e ) 12 sec
Output: b
Input: Problem: what is the maximum number of pieces of birthday cake of size 4 ” by 4 ” that can be cut from a cake 16 ” by 16 ” ? 
Options: a ) 5 , b ) 4 , c ) 16 , d ) 20 , e ) 25
Output: c
Input: Problem: a boat having a length 4 m and breadth 2 m is floating on a lake . the boat sinks by 1 cm when a man gets on it . the mass of the man is : 
Options: a ) 12 kg , b ) 60 kg , c ) 72 kg , d ) 80 kg , e ) none of these
Output: d
Input: Problem: a car started running at a speed of 30 km / hr and the speed of the car was increased by 2 km / hr at the end of every hour . find the total distance covered by the car in the first 11 hours of the journey . 
Options: a ) 342 km , b ) 352 km , c ) 642 km , d ) 440 km , e ) 382 km
Output: d
Input: Problem: if a is thrice as fast as b and together can do a work in 15 days . in how many days a alone can do the work ? 
Options: a ) 36 , b ) 20 , c ) 28 , d ) 54 , e ) 45
Output: b
Input: Problem: two bullet train s 140 m and 210 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks . the time ( in seconds ) which they take to cross each other , is : 
Options: a ) 15.8 sec . , b ) 12.6 sec . , c ) 11.8 sec . , d ) 10.8 sec . , e ) 08.8 sec .
Output: b
Input: Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train . 
Options: a ) 150 meter , b ) 286 meter , c ) 180 meter , d ) 288 meter , e ) 265 meter
Output: c
Input: Problem: the length of the bridge , which a train 120 meters long and travelling at 45 km / hr can cross in 30 seconds , is ? 
Options: a ) 328 , b ) 279 , c ) 255 , d ) 288 , e ) 211
Output: c
Input: Problem: a can do a job in 15 days and b in 20 days . if they work on it together for 3 days , then the fraction of the work that is left is ? 
Options: a ) 2 / 15 , b ) 8 / 15 , c ) 13 / 20 , d ) 1 / 12 , e ) 6 / 13
Output: c
Input: Problem: 3 different containers contain 50 litres , 100 litres and 150 litres of mixture of milk and water respectively . what is the biggest measure can measure all the different quantities exactly ? 
Options: a ) 120 litres , b ) 57 litres , c ) 60 litres , d ) 50 litres , e ) 100 litres
Output: d
Input: Problem: the volume of water inside a swimming pool doubles every hour . if the pool is filled to its full capacity within 8 hours , in how many hours was it filled to one quarter of its capacity ? 
Options: ['a ) 2', 'b ) 4', 'c ) 5', 'd ) 6', 'e ) 7']
Output: d
Input: Problem: johnny makes $ 4.75 per hour at his work . if he works 6 hours , how much money will he earn ? 
Options: a ) $ 30 , b ) $ 54 , c ) $ 28.50 , d ) $ 12 , e ) $ 9.60
Output: c
Input: Problem: an engineer undertakes a project to build a road 15 km long in 300 days and employs 30 men for the purpose . after 100 days , he finds only 2.5 km of the road has been completed . find the ( approximate ) number of extra men he must employ to finish the work in time . 
Options: a ) a . 43 , b ) b . 45 , c ) c . 55 , d ) d . 68 , e ) e . 60
Output: b
Input: Problem: two trains 250 m and 500 m long run at the speed of 60 km / hr and 40 km / hr respectively in opposite directions on parallel tracks . the time which they take to cross each other is ? 
Options: a ) 10.6 , b ) 10.9 , c ) 10.4 , d ) 27 , e ) 10.1
Output: d
Input: Problem: pipe a fills a tank of capacity 900 liters at the rate of 40 liters a minute . another pipe b fills the same tank at the rate of 30 liters a minute . a pipe at the bottom of the tank drains the tank at the rate of 20 liters a minute . if pipe a is kept open for a minute and then closed and pipe b is open for a minute and then closed and then pipe c is open for a minute and then closed and the cycle is repeated , when will the tank be full ? 
Options: a ) 42 minutes , b ) 14 minutes , c ) 54 minutes , d ) 40 minutes 20 seconds , e ) none of these
Output: c
Input: Problem: b completes a work in 6 days . a alone can do it in 10 days . if both work together , the work can be completed in how many days ? 
Options: a ) 3.33 days , b ) 4.33 days , c ) 5.33 days , d ) 6.33 days , e ) 7.33 days
Output: a
Input: Problem: john and andrew can finish the work 9 days if they work together . they worked together for 6 days and then andrew left . john finished the remaining work in another 6 days . in how many days john alone can finish the work ? 
Options: a ) 30 days , b ) 60 days , c ) 18 days , d ) 80 days , e ) 90 days
Output: c
Input: Problem: how long does a bus 100 m long traveling at 50 kmph takes to cross a bridge of 150 m in length ? 
Options: a ) 18 , b ) 16 , c ) 15 , d ) 11 , e ) 12
Output: a
Input: Problem: in a dairy farm , 34 cows eat 34 bags of husk in 34 days . in how many days one cow will eat one bag of husk ? 
Options: a ) 34 days , b ) 40 days , c ) 46 days , d ) 50 days , e ) none of these
Output: a
Input: Problem: y and z walk around a circular track . they start at 5 a . m from the same point in the opposite directions . y and z walk at a speed of 3 rounds per hour and 4 rounds per hour respectively . how many times shall they cross each other before 7 a . m 
Options: a ) 14 , b ) 15 , c ) 16 , d ) 17 , e ) 18
Output: e
Input: Problem: in a garment industry , 12 men working 8 hours per day complete a piece of work in 10 days . to complete the same work in 8 days , working 13.33 hours a day , the number of men required is : 
Options: a ) 4 , b ) 5 , c ) 6 , d ) 8 , e ) 9
Output: e
Input: Problem: an engineer undertakes a project to build a road 15 km long in 300 days and employs 55 men for the purpose . after 100 days , he finds only 2.5 km of the road has been completed . find the ( approximate ) number of extra men he must employ to finish the work in time . 
Options: a ) a . 43 , b ) b . 45 , c ) c . 55 , d ) d . 68 , e ) e . 83
Output: e
Input: Problem: a and b together can complete a piece of work in 10 days . if a alone can complete the same work in 15 days , in how many days , in how many days can b alone complete that work ? 
Options: a ) 10 , b ) 30 , c ) 25 , d ) 15 , e ) 45
Output: b
Input: Problem: what distance will be covered by a city bus moving at 72 kmph in 30 seconds ? 
Options: a ) 200 m , b ) 300 m , c ) 600 m , d ) 500 m , e ) 400 m
Output: c
Input: Problem: at 3 : 40 , the hour hand and the minute hand of a clock form an angle of : 
Options: a ) 130 , b ) 125 , c ) 140 , d ) 154 , e ) 145
Output: a
Input: Problem: a car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 450 kilometers per hour . at what speed , in kilometers per hour , is the car traveling ? 
Options: a ) 370 , b ) 365 , c ) 360 , d ) 380 , e ) 350
Output: c
Input: Problem: danny and steve are running towards each other , each one from his own house . danny can reach steve ' s house in 27 minutes of running , which is half the time it takes steve to reach danny ' s house . if the two started to run at the same time , how much time longer will it take steve to reach the halfway point between their houses than danny to reach the halfway point between their houses ? 
Options: a ) 13.5 minutes , b ) 27 minutes , c ) 35 minutes , d ) 54 minutes , e ) 81 minutes
Output: a
Input: Problem: two trains are moving in opposite directions at 60 km / hr and 90 km / hr . their lengths are 1.10 km and 0.9 km respectively . the time taken by the slower train to cross the faster train in seconds is ? 
Options: a ) 26 sec , b ) 76 sec , c ) 48 sec , d ) 27 sec , e ) 22 sec
Output: c
Input: Problem: a tree of height 36 m is on one edge of a road broke at a certain height . it fell in such a way that the top of the tree touches the other edge of the road . if the breadth of the road is 12 m , then what is the height at which the tree broke ? 
Options: a ) 16 , b ) 17 , c ) 18 , d ) 19 , e ) 20
Output: a
Input: Problem: what is the speed of the stream if a canoe rows upstream at 9 km / hr and downstream at 12 km / hr 
Options: a ) 1 kmph , b ) 4 kmph , c ) 3 kmph , d ) 2 kmph , e ) 1.5 kmph
Output: e
Input: Problem: a train of 25 carriages , each of 60 meters length , when an engine also of 60 meters length is running at a speed of 60 kmph . in what time will the train cross a bridge 1.0 km long ? 
Options: a ) 2.5 , b ) 3 , c ) 5 , d ) 7 , e ) 9
Output: a
Input: Problem: in a kilometer race , a beats b by 51 meters or 11 seconds . what time does a take to complete the race ? 
Options: a ) 22 , b ) 190 , c ) 277 , d ) 204 , e ) 208
Output: d
Input: Problem: due to construction , the speed limit along an 9 - mile section of highway is reduced from 55 miles per hour to 20 miles per hour . approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ? 
Options: a ) a ) 5.61 , b ) b ) 8 , c ) c ) 10 , d ) d ) 17.19 , e ) e ) 24
Output: d
Input: Problem: working together , jose and jane can complete an assigned task in 20 days . however , if jose worked alone and completed half the work and then jane takes over and completes the second half , the task will be completed in 45 days . how long will jose take to complete the task if he worked alone ? assume that jane is more efficient than jose . 
Options: a ) 25 days , b ) 30 days , c ) 60 days , d ) 65 days , e ) 36 days
Output: c
Input: Problem: a person walks from one end to the other of a 60 - meter long moving walkway at a constant rate in 30 seconds , assisted by the walkway . when this person reaches the end , they reverse direction and continue walking with the same speed , but this time it takes 120 seconds because the person is traveling against the direction of the moving walkway . if the walkway were to stop moving , how many seconds would it take this person to walk from one end of the walkway to the other ? 
Options: a ) 48 , b ) 60 , c ) 72 , d ) 84 , e ) 96
Output: a
Input: Problem: an electric pump can fill a tank in 6 hours . because of a leak in the tank , it took 12 hours to fill the tank . if the tank is full , how much time will the leak take to empty it ? 
Options: a ) 10 hours , b ) 12 hours , c ) 8 hours , d ) 5 hours , e ) 15 hours
Output: b
Input: Problem: a train is moving at 6 / 7 of its usual speed . the train is 10 minutes too late . what is the usual time ( in hours ) for the train to complete the journey ? 
Options: a ) 0.5 , b ) 1 , c ) 1.5 , d ) 2 , e ) 2.5
Output: b
Input: Problem: jack and christina are standing 270 feet apart on a level surface . their dog , lindy , is standing next to christina . at the same time , they all begin moving toward each other . jack walks in a straight line toward christina at a constant speed of 4 feet per second and christina walks in a straight line toward jack at a constant speed of 5 feet per second . lindy runs at a constant speed of 8 feet per second from christina to jack , back to christina , back to jack , and so forth . what is the total distance , in feet , that lindy has traveled when the three meet at one place ? 
Options: a ) 150 , b ) 180 , c ) 210 , d ) 240 , e ) 270
Output: d
Input: Problem: gary ’ s gas station serves an average of 14 cars per hour on saturdays , 10 cars per hour on sundays , and 9 cars per hour on all other days of the week . if the station is open from 6 a . m . to 10 p . m . every day , how many cars does gary ’ s station serve over the course of a typical week ? 
Options: a ) 1,104 , b ) 1,200 , c ) 1,240 , d ) 1,280 , e ) 1,320
Output: a
Input: Problem: car x began traveling at an average speed of 35 miles per hour . after 72 minutes , car y began traveling at an average speed of 38 miles per hour . when both cars had traveled the same distance , both cars stopped . how many miles did car x travel from the time car y began traveling until both cars stopped ? 
Options: a ) 405 , b ) 420 , c ) 440 , d ) 447 , e ) 490
Output: e
Input: Problem: two good train each 650 m long , are running in opposite directions on parallel tracks . their speeds are 45 km / hr and 30 km / hr respectively . find the time taken by the slower train to pass the driver of the faster one . 
Options: a ) 12.4 sec , b ) 24.3 sec , c ) 62.4 sec , d ) 60.1 sec , e ) none
Output: c
Input: Problem: a can complete a project in 20 days and b can complete the same project in 30 days . if a and b start working on the project together and b quits 15 days before the project is completed , in how many days total will the project be completed ? 
Options: a ) 12 , b ) 14 , c ) 16 , d ) 18 , e ) 20
Output: d