A motor-boat whose speed is 9 km/hr in still water, goes 12 km downstream

A motor-boat whose speed is 9 km/hr in still water, goes 12 km downstream and comes back in a total time of 3 hours. Find the speed of the stream.
(a) 3 km/hr
(b) 4 km/hr
(c) 6 km/hr
(d) 9 km/hr

Anurag Mishra Professor Asked on 8th March 2016 in Maths.
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    Answer: (a) 3 km/hr

    Anurag Mishra Professor Answered on 9th March 2016.
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