instruction:
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'.
question:
Problem: a , b and c can do a piece of work in 9 days , 14 days and 28 days respectively . how long will they taken , if all the three work together ? 
Options: a ) 4.12 days , b ) 4.52 days , c ) 3.52 days , d ) 2.52 days , e ) 4.92 days
answer:
b


question:
Problem: find the length of the longest pole that can be placed in an indoor stadium 24 m long , 18 m wide and 16 m high 
Options: a ) 31 , b ) 32 , c ) 33 , d ) 34 , e ) 35
answer:
d


question:
Problem: a train 150 m long running at 72 kmph crosses a platform in 28 sec . what is the length of the platform ? 
Options: a ) 410 m , b ) 354 m , c ) 450 m , d ) 350 m , e ) 250 m
answer:

a