In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
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Question: Problem: a can finish a piece of work in 12 days . b can do it in 20 days . they work together for 9 days and then a goes away . in how many days will b finish the work ? 
Options: a ) 6 days , b ) 4 days , c ) 5 days , d ) 3 days , e ) 7 days

Answer: c


Question: Problem: debony normally drives to work in 45 minutes at an average speed of 40 miles per hour . this week , however , she plans to bike to work along a route that decreases the total distance she usually travels when driving by 20 % . if debony averages between 12 and 16 miles per hour when biking , how many minutes earlier will she need to leave in the morning in order to ensure she arrives at work at the same time as when she drives ? 
Options: a ) 135 , b ) 105 , c ) 95 , d ) 75 , e ) 45

Answer: d


Question: Problem: a train of length 250 m crosses a bridge of length 180 m in 20 seconds . what is the speed of train ? 
Options: a ) 33 , b ) 77.4 , c ) 25 , d ) 22 , e ) 72

Answer:
b