A river is flowing from north to south at a speed of \( 0.3 \mathrm{kph} \). A man on the west b...

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A river is flowing from north to south at a speed of \( 0.3 \mathrm{kph} \). A man on the west bank of the river, capable of swimming \( 1 \mathrm{kph} \) in still water, wants to swim across the river in the shortest time. He should in a direction :
(A) Due east
(B) \( 30^{\circ} \) north of east
(C) \( 30^{\circ} \) west of north
(D) \( 60^{\circ} \) north of east
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