A man can row upstream at 26 kmph and downstream at 40 kmph, and then find the speed of the man in still water? Choose the most appropriate option:
A) 22 B) 37 C) 30 D) 33 E) 18

Rationale: "us = 26 ds = 40 m = ( 40 + 26 ) / 2 = 33 answer : d"
Answer: D