A man can row his boat with the stream at 18 km/h and against the stream in 8 km/h. The man's rate is?  Choose the correct option:	A) 5 kmph	B) 2 kmph	C) 7 kmph	D) 8 kmph	E) 3 kmph

Rationale: "ds = 18 us = 8 s = ? s = ( 18 - 8 ) / 2 = 5 kmph answer : a"
Answer: A