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'.

[Q]: Problem: when working alone , painter w can paint a room in 2 hours , and working alone , painter x can paint the same room in h hours . when the two painters work together and independently , they can paint the room in 3 / 4 of an hour . what is the value of h ? 
Options: a ) 3 / 4 , b ) 1 [ 1 / 5 ] , c ) 1 [ 2 / 5 ] , d ) 1 [ 3 / 4 ] , e ) 2
[A]: b


[Q]: Problem: a 180 meter long train crosses a man standing on the platform in 9 sec . what is the speed of the train ? 
Options: a ) 72 , b ) 108 , c ) 1266 , d ) 188 , e ) 211
[A]: a


[Q]: Problem: how many seconds will a 900 metre long train take to cross a man walking with a speed of 3 km / hr in the direction of the moving train if the speed of the train is 63 km / hr ? 
Options: a ) 25 , b ) 30 , c ) 40 , d ) 45 , e ) 54
[A]:
e