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'.

[EX Q]: 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
[EX A]: d

[EX Q]: Problem: if 36 men can do a piece of work in 25 hours , in how many hours will 12 men do it ?
Options: a ) 22 , b ) 38 , c ) 60 , d ) 88 , e ) 75
[EX A]: e

[EX Q]: Problem: a boat takes 19 hours for travelling downstream from point a to point b and coming back to a point c midway between a and b . if the velocity of the stream is 4 km / h and the speed of the boat in still water is 14 km / h , what is the distance between a and b ?
Options: a ) 200 km , b ) 180 km , c ) 160 km , d ) 220 km , e ) none of these
[EX A]:
b