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Q.

A man can swim in still water at a speed of 5 kmph and he has to cross the river and reach just opposite point on the other bank. If the river is flowing at a speed of 3 kmph, and the width of the river is 4 km, the time taken to cross the river is (in hours)

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a

2

b

3

c

1/2

d

1

answer is A.

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Detailed Solution

$t = \frac{s}{\sqrt{v_{b}^{2} - v_{w}^{2}}} = \frac{4}{4} = 1$

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A man can swim in still water at a speed of 5 kmph and he has to cross the river and reach just opposite point on the other bank. If the river is flowing at a speed of 3 kmph, and the width of the river is 4 km, the time taken to cross the river is (in hours)