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A man can row a boat with \( 8 \mathrm{~km} / \) hour in still water. If he is crossing a river where the current is 4
\( \mathrm{P} \)
\( \mathrm{km} / \) hour, in what direction should he head the boat
W
to cross the river in shorted time and in what minimum time, he will cross ? (Width of river is 8 \( \mathrm{km}) \)
(1) \( 30^{\circ}, \frac{2}{\sqrt{3}} \mathrm{hr} \)
(2) \( 60^{\circ}, \frac{2}{\sqrt{3}} \mathrm{hr} \)
(3) \( 90^{\circ}, 1 \mathrm{hr} \)
(4) \( 120^{\circ} \) and \( \frac{4}{3} \mathrm{hr} \)
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