A river is flowing from \( W \) to \( E \) with a speed of \( 5 \ma...

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A river is flowing from \( W \) to \( E \) with a speed of \( 5 \mathrm{~m} / \mathrm{min} \). A man can swim in still water with a velocity \( 10 \mathrm{~m} / \mathrm{min} \).
\( \mathrm{P} \) In which direction should the man swim so as to take

W. the shortest possible path to go to the south.
(1) \( 30^{\circ} \) with downstream
(2) \( 60^{\circ} \) with downstream
(3) \( 120^{\circ} \) with downstream
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