A man can row upstream at 40 kmph and downstream at 52 kmph, and then find the speed of the man in still water?
Choose the most appropriate option.
A) 27	B) 40	C) 42	D) 46	E) 24

Rationale: "us = 40 ds = 52 m = ( 40 + 52 ) / 2 = 46 answer : d"
Answer: D