A man can row his boat with the stream at 16 km/h and against the stream in 6 km/h. The man's rate is?
Pick.
A) 5 kmph B) 6 kmph C) 7 kmph D) 4 kmph E) 9 kmph

Rationale: "explanation : ds = 16 us = 6 s = ? s = ( 16 - 6 ) / 2 = 5 kmph answer : a"
Answer: A