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

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A boat which has a speed of \( 5 \mathrm{~km} / \mathrm{hr} \) in still water crosses a river of width \( 1 \mathrm{~km} \) along the shortest
P
possible path in 15 minutes. The velocity of the river
W
water (in \( \mathrm{km} / \mathrm{hr} \) ) is
(1) 1
(2) 3
(3) 4
(4) 40
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