A man can row upstream at 37 kmph and downstream at 53 kmph, and then find the speed of the man in still water? Select the correct option:
A) 29  B) 92  C) 30  D) 32  E) 45

Rationale: "us = 37 ds = 53 m = ( 53 + 37 ) / 2 = 45 answer : e"
Answer: E