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A man can row a boat in still water with a velocity of
\( \mathrm{P} \) \( 8 \mathrm{kmph} \). Water is flowing in a river with a velocity of

W \( 4 \mathrm{kmph} \). At what angle should he row the boat so as to reach the exact opposite point
(1) \( 150^{\circ} \) to flow of water
(2) \( 120^{\circ} \) to flow of water.
(3) \( 30^{\circ} \) to flow of water
(4) \( 90^{\circ} \) to flow of water.
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