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: in traveling from a dormitory to a certain city , a student went 1 / 5 of the way by foot , 2 / 3 of the way by bus , and the remaining 14 kilometers by car . what is the distance , in kilometers , from the dormitory to the city ? 
Options: a ) 30 , b ) 45 , c ) 60 , d ) 90 , e ) 105
[EX A]: e

[EX Q]: Problem: a man can row upstream at 5 kmph and downstream at 25 kmph , and then find the speed of the man in still water ? 
Options: a ) 15 , b ) 77 , c ) 30 , d ) 88 , e ) 34
[EX A]: a

[EX Q]: Problem: a works twice as fast as b . if b can complete a work in 12 days independently , the number of days in which a and b can together finish the work is : 
Options: a ) 4 days , b ) 6 days , c ) 8 days , d ) 18 days , e ) none of these
[EX A]:
a