A man can row downstream at 12 km/h and upstream at 8 km/h. What is the speed of man in still water?

12 km/h

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10 km/h

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8 km/h

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9 km/h

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Solution

The correct option is B
10 km/h

Speed of man in still water $= \frac{S_{D} + S_{U}}{2} = \frac{12 + 8}{2} = 10 k m / h$
$S_{D} \to$ Speed in downstream ( = Boat + River)
$S_{U} \to$ Speed in upstream ( = Boat - River)

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