A boat, which has a speed of \( 5 \mathrm{~km} / \mathrm{h} \) in s...

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A boat, which has a speed of \( 5 \mathrm{~km} / \mathrm{h} \) in still water, crosses a river of width \( 1 \mathrm{~km} \) along the shortest possible path in
P 15 minutes. The velocity of the river water in \( \mathrm{km} / \mathrm{h} \) is -

W.
(1) 1
(2) 3
(3) 4
(4) \( \sqrt{41} \)
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