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 Input:
Problem: an outlet pipe empties a tank which is full in 5 hours . if the inlet pipe is kept open , which lets water in at the rate of 8 litres / min then outlet pipe would take 3 hours longer . find the capacity of the tank . 
Options: a ) 8600 litres , b ) 200 litres , c ) 12800 litres , d ) 6400 litres , e ) 13200 litres

Ex Output:
d


Ex Input:
Problem: if 8 people take an hour to complete a piece of work , then how long should 16 people will take to complete the same piece of work ? 
Options: a ) 15 min , b ) 30 min , c ) 26 min , d ) 28 min , e ) 18 min

Ex Output:
b


Ex Input:
Problem: a walk 20 m towards north east . b walk towards east 8 m and then 12 m south . now calculate distance between a and b ? 
Options: a ) 30 m , b ) 20 m , c ) 35 m , d ) 40 m , e ) 38 m

Ex Output:

a