A man can row upstream at 35 kmph and downstream at 45 kmph, and then find the speed of the man in still water?
Choices: A) 32 kmph B) 34 kmph C) 40 kmph D) 45 kmph E) 65 kmph

Rationale: "us = 35 ds = 45 m = ( 35 + 45 ) / 2 = 40 answer : c"
Answer: C