A man can row at a speed of 15 km hr in still water to a certain upstream point and back to the star...........

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A man can row at a speed of 15 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 9 km/hr. Find his average speed for total journey.

10.4 km/hr

8.4 km/hr

9.1 km/hr

9.6 km/hr

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Explanation:

When the distance is same, then average speed throughout journey would be:
Speed downstream * Speed upstream/speed in still water.
So here average speed = (15+9)*(15-9)/15 = 9.6 km/hr

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