A river is flowing from west to east with a speed \( 5 \mathrm{~m} \mathrm{~s}^{-1} \). A swimme....

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A river is flowing from west to east with a speed \( 5 \mathrm{~m} \mathrm{~s}^{-1} \).
\( \mathrm{P} \)
A swimmer can swim in still water at a speed of
W
\( 10 \mathrm{~m} \mathrm{~s}^{-1} \). If he wants to start from point \( A \) on south bank and reach opposite point B on north bank, in what direction should he swim?
(1) \( 30^{\circ} \) east of north (2) \( 60^{\circ} \) east of north
(3) \( 30^{\circ} \) west of north (4) \( 60^{\circ} \) west of north


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