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A man can swim in still water with velocity 2 km/hr. He wants to cross the river flowing at a speed of 1.5 km/ hr. If man always swims at 150° with downstream and river is 800 m wide then

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The man will reach directly opposite point on the other bank.

Time taken by the man to reach the opposite bank is 48 minute.

Time taken by the man to reach the opposite bank is 32 minute.

Man will miss the directly opposite point by 42.6m.

answer is B.

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Detailed Solution

t = Time taken by the man to cross the river
$= \frac{b}{V_{mw} \sin 30^{\circ}} = \frac{0 .8}{2 \times 1 / 2} hr = 0 .8 hr$
= 48 minutes

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