A man can row his boat with the stream at 20 km/h and against the stream in 8 km/h. The man's rate is?	Answers:
A) 1 kmph
B) 7 kmph
C) 6 kmph
D) 5 kmph
E) 4 kmph

Rationale: "ds = 20 us = 8 s = ? s = ( 20 - 8 ) / 2 = 6 kmph answer : c"
Answer: C