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: a is twice as good a workman as b and together they complete a work in 12 days . in how many days a alone can do the work ? 
Options: a ) 32 , b ) 33 , c ) 34 , d ) 35 , e ) 36
[A]: e


[Q]: Problem: two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 21 seconds . the ratio of their speeds is ? 
Options: a ) 3 / 6 , b ) 3 / 2 , c ) 2 / 3 , d ) 3 / 5 , e ) 5 / 2
[A]: c


[Q]: Problem: a man swims downstream 120 km and upstream 50 km taking 5 hours each time ; what is the speed of the current ? 
Options: a ) 3 kmph , b ) 7 kmph , c ) 13 kmph , d ) 6.5 kmph , e ) 7 : 3 kmph
[A]:
b