A man swims from a point \( A \) on one bank of a river of width \( 100 \mathrm{~m} \). When he ...

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A man swims from a point \( A \) on one bank of a river of width \( 100 \mathrm{~m} \). When he swims perpendicular to the water current, he reaches the other bank \( 50 \mathrm{~m} \) downstream. The angle to the bank at which he should swim, to reach the directly opposite point \( B \) on the other bank is
(1) \( 10^{\circ} \) upstream
(2) \( 20^{\circ} \) upstream
(3) \( 30^{\circ} \) upstream
(4) \( 60^{\circ} \) upstream
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