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: two trains of equal length , running with the speeds of 60 and 40 kmph , take 36 seconds to cross each other while they are running in the same direction . what time will they take to cross each other if they are running in opposite directions ? 
Options: a ) 10 sec , b ) 16 sec , c ) 19 sec , d ) 7.2 sec , e ) 13 sec
[A]: d


[Q]: Problem: if 12 men do a work in 80 days , in how many days will 16 men do it ? 
Options: a ) 22 , b ) 87 , c ) 77 , d ) 60 , e ) 85
[A]: d


[Q]: Problem: in one hour , a boat goes 11 km along the stream and 5 km against the stream . the speed of the boat in still water in ( km / hr ) is 
Options: a ) 3 , b ) 5 , c ) 8 , d ) 9 , e ) 7
[A]:
c