A boat goes 15 km upstream in 80 minutes and speed of the stream is 5 km/h.? The speed of the boat in still water is

16.25 km/h

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16 km/h

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15 km/h

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17 km/h

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Solution

The correct option is A 16.25 km/h
$t = \frac{D}{S_{B} - S_{S}} (u p s t r e a m) = \frac{80}{60} = \frac{15}{S_{B} - 5} = \frac{4}{3} = \frac{15}{S_{B} - 5} S_{B} = 16.25 k m / h$

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