A man can row upstream at 8kmph and downstream at 13 kmph. The speed of the stream is
Choices: A) 2.5 km/hr B) 4.2 km/hr C) 5 km/hr D) 10.5 km/hr E) None
Sol.   Speed of stream = 1/2(13 -8) kmph = 2.5 kmph.   2.5 km/hrnswer 2.5 km/hr
<result>A</result>
A man can row upstream at 8kmph and downstream at 13 kmph. The speed of the stream is