If the swimmer wants to cross the river in minimum time, then this minimum time taken by swimmer to cross the river is:

20 sec.

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15 sec.

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12 sec.

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None of these

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Solution

The correct option is D 12 sec.
Given : $V_{S R} = 5 m / s$ $V_{R} = 4 m / s$
Width of the river $d = 60$ m
$∴$ Minimum time taken to cross the river $t = \frac{d}{V_{S R}}$
$⟹$ $t = \frac{60}{5} = 12$ sec

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