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'.

Example Input: Problem: a car takes 6 hours to cover a distance of 504 km . how much should the speed in kmph be maintained to cover the same direction in 3 / 2 th of the previous time ? 
Options: a ) 48 kmph , b ) 50 kmph , c ) 52 kmph , d ) 56 kmph , e ) 60 kmph
Example Output: d

Example Input: Problem: a man and a boy complete a work together in 24 days . if for the last 6 days man alone does the work then it is completed in 26 days . how long the boy will take to complete the work alone ? 
Options: a ) 72 days , b ) 20 days , c ) 24 days , d ) 36 days , e ) 34 days
Example Output: a

Example Input: Problem: what distance will be covered by a bus moving at 126 kmph in 10 seconds ? 
Options: a ) 287 , b ) 600 , c ) 350 , d ) 276 , e ) 207
Example Output:
c