What is the speed of the stream if a canoe rows upstream at 9 km/hr and downstream at 12km/hr
Select:  A) 1 kmph  B) 4 kmph  C) 3 kmph  D) 2 kmph  E) 1.5 kmph

Rationale: "sol . speed of stream = 1 / 2 ( 12 - 9 ) kmph = 1.5 kmph . answer e"
Answer: E