A man can row upstream at 20 kmph and downstream at 80 kmph, and then find the speed of the man in still water?
Choose the correct option: A) 32 kmph B) 50 kmph C) 30 kmph D) 45 kmph E) 65 kmph

Rationale: "us = 20 ds = 80 m = ( 20 + 80 ) / 2 = 50 answer : b"
Answer: B