A man can row upstream at 12 kmph and downstream at 38 kmph, and then find the speed of the man in still water?
Options: A) 11 B) 25 C) 30 D) 88 E) 34

Rationale: "us = 12 ds = 38 m = ( 12 + 38 ) / 2 = 25 answer : b"
Answer: B