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: an employer pays rs . 20 for each day a worker works and for felts rs . 3 for each day is ideal at the end of sixty days a worker gets rs . 280 . for how many days did the worker remain ideal ? 
Options: a ) 10 , b ) 40 , c ) 30 , d ) 20 , e ) 50
[EX A]: b

[EX Q]: Problem: a train 200 m long is running with a speed of 68 kmph . in what time will it pass a man who is running at 8 kmph in the same direction in which the train is going ? 
Options: a ) 6 sec . , b ) 7 sec . , c ) 9 sec . , d ) 12 sec . , e ) none
[EX A]: d

[EX Q]: Problem: a can do a piece of work in 10 days and b alone can do it in 15 days . how much time will both take to finish the work ? 
Options: a ) 2 days , b ) 7 days , c ) 6 days , d ) 9 days , e ) 3 days
[EX A]:
c