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: jake can dig a well in 16 days . paul can dig the same well in 24 days . jake , paul and hari together dig the well in 8 days . hari alone can dig the well in 
Options: a ) 96 days , b ) 48 days , c ) 32 days , d ) 24 days , e ) 28 days
[EX A]: b

[EX Q]: Problem: a train passes a station platform in 31 sec and a man standing on the platform in 20 sec . if the speed of the train is 54 km / hr . what is the length of the platform ? 
Options: a ) 228 , b ) 240 , c ) 165 , d ) 166 , e ) 1811
[EX A]: c

[EX Q]: Problem: if in a race of 110 m , a covers the distance in 20 seconds and b in 25 seconds , then a beats b by : 
Options: a ) 20 m , b ) 16 m , c ) 11 m , d ) 22 m , e ) 15 m
[EX A]:
d