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'.

[Q]: Problem: if 36 men can do a piece of work in 5 hours , in how many hours will 15 men do it ? 
Options: a ) 12 , b ) 38 , c ) 60 , d ) 88 , e ) 72
[A]: a


[Q]: Problem: the speed of a car is 60 km in the first hour and 30 km in the second hour . what is the average speed of the car ? 
Options: a ) 45 kmph , b ) 65 kmph , c ) 75 kmph , d ) 85 kmph , e ) 90 kmph
[A]: a


[Q]: Problem: a is twice as good a work man as b and together they finish the work in 12 days . in how many days a alone can finish the work ? 
Options: a ) 12 days , b ) 14 days , c ) 28 days , d ) 18 days , e ) 16 days
[A]:
d