A man can row upstream at 60 kmph and downstream at 90 kmph, and then find the speed of the man in still water?
Choose the correct choice from the following options.
A) 75 kmph B) 65 kmph C) 30 kmph D) 73 kmph E) 65 kmph

Rationale: us = 60 ds = 90 m = ( 60 + 90 ) / 2 = 75 answer : a
Answer: A