A man goes downstream at 15 kmph, and upstream8 kmph. The speed of the stream is	Choose the most appropriate option.
A) 0 kmph B) 3.5 kmph C) 16 kmph D) 2.5 kmph E) 26 kmph

Rationale: "speed of the stream = 1 / 2 ( 15 - 8 ) kmph = 3.5 kmph . correct option : b"
Answer: B