The speed of a boat is 5 km/h in still water. It crosses a river of width 1.0 km along the shortest path in 15 minutes. The velocity of the river water is (in km/h)

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The speed of a boat is 5 km/h in still water. It crosses a river of width 1.0 km along the shortest path in 15 minutes. The velocity of the river water is (in km/h)

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answer is C.

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Detailed Solution

$t = \frac{W}{\sqrt{V_{B}^{2} - V_{R}^{2}}} \Rightarrow \frac{1}{4} = \frac{1}{\sqrt{5^{2} - V_{R}^{2}}}$

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