A man can row upstream at 5 kmph and downstream at 25kmph, and then find the speed of the man in still water?	Choices
A) 15	B) 77	C) 30	D) 88	E) 34

Rationale: "us = 5 ds = 25 m = ( 5 + 25 ) / 2 = 15 answer : a"
Answer: A