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: a man can row upstream at 26 kmph and downstream at 30 kmph , and then find the speed of the man in still water ? 
Options: a ) 29 , b ) 28 , c ) 30 , d ) 32 , e ) 23
[EX A]: b

[EX Q]: Problem: a train 50 m long takes 6 sec to cross a man walking at 5 kmph in a direction opposite to that of the train . find the speed of the train ? 
Options: a ) 15 kmph , b ) 25 kmph , c ) 35 kmph , d ) 45 kmph , e ) 55 kmph
[EX A]: b

[EX Q]: Problem: a train speeds past a pole in 10 seconds and a platform 150 m long in 25 seconds . its length is : 
Options: a ) 300 m . , b ) 250 m . , c ) 100 m . , d ) 200 m . , e ) 150 m .
[EX A]:
c