A river is flowing with a speed of \( 1 \mathrm{~km} / \mathrm{hr} \). \( A \) swimmer wants to ...

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A river is flowing with a speed of \( 1 \mathrm{~km} / \mathrm{hr} \). \( A \) swimmer wants to go to point. \( C \) starting from \( A \) . He swims with a speed of \( 5 \mathrm{~km} / \mathrm{hr} \), at an angle \( \theta \) w.r.t. the river flow. If \( A B=B C \) \( =400 \mathrm{~m} \). At what angle with river bank should swimmer swim? Then the value of \( \theta \) is:
(a) \( 30^{\circ} \)
(b) \( 37^{\circ} \)
(c) \( 53^{\circ} \)
(d) \( 60^{\circ} \)
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