What is the speed of the stream if a canoe rows upstream at 3km/hr and downstream at 12km/hr Choose the correct answer.
A) 1 kmph	B) 4 kmph	C) 3 kmph	D) 2 kmph	E) 4.5 kmph
Sol.   Speed of stream = 1/2(12 -3) kmph = 4.5 kmph.   Answer 4.5 kmph
<result>E</result>
What is the speed of the stream if a canoe rows upstream at 3km/hr and downstream at 12km/hr