A river is flowing at the rate of \( 6 \mathrm{~km} / \mathrm{h} \)...

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A river is flowing at the rate of \( 6 \mathrm{~km} / \mathrm{h} \). A swimmer
\( \mathrm{P} \) swims across the river with a velocity of \( 9 \mathrm{~km} / \mathrm{h} \) w.r.t.

W water. These resultant velocity of the man will be in \( (\mathrm{km} / \mathrm{h}) \) :
(1) \( \sqrt{117} \)
(2) \( \sqrt{340} \)
(3) \( \sqrt{17} \)
(4) \( 3 \sqrt{40} \)
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