The stream of a river is flowing with a speed of \( 2 \mathrm{~km} ...

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The stream of a river is flowing with a speed of \( 2 \mathrm{~km} / \mathrm{h} \).
A swimmer can swim at a speed of \( 4 \mathrm{~km} / \mathrm{h} \). What should be the direction of the swimmer with respect to the flow of the river to cross the river straight ?
(a) \( 60^{\circ} \)
(b) \( 120^{\circ} \)
(c) \( 90^{\circ} \)
(d) \( 150^{\circ} \)
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