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'.

Problem: two trains are moving in opposite directions with speed of 90 km / hr and 90 km / hr respectively . their lengths are 1.10 km and 0.9 km respectively . the slower train cross the faster train in - - - seconds 
Options: a ) 56 , b ) 40 , c ) 47 , d ) 26 , e ) 25
b

Problem: in what time will a railway train 80 m long moving at the rate of 40 kmph pass a telegraph post on its way ? 
Options: a ) 3 , b ) 5 , c ) 4 , d ) 6.4 , e ) 7.2
e

Problem: a can do a job in 5 days and b can do it in 15 days . a and b working together will finish twice the amount of work in - - - - - - - days ? 
Options: a ) 21 ½ days , b ) 22 ½ days , c ) 23 ½ days , d ) 12 ½ days , e ) 7 ½ days

e