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A person is swimming with a speed of 10 m/s at an angle of $120^{0}$ with the flow and reaches to a point directly opposite on the other side of the river. The speed of the flow is ‘x’ m/s . The value of ‘x’ to the nearest integer is __

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answer is D.

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Detailed Solution

$\sin 30^{0} = \frac{v_{r}}{v_{s}} = \frac{1}{2} \times 10 = v_{r} = 5$

Take angle with river vertical side as $30^{0}$

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