A man can row upstream at 25 kmph and downstream at 43 kmph, and then find the speed of the man in still water? Select the correct option.
A) 86 B) 34 C) 30 D) 15 E) 17

Rationale: "us = 25 ds = 43 m = ( 43 + 25 ) / 2 = 34 answer : b"
Answer: B