A person, reaches a point directly opposite on the \( \mathrm{P} \)...

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A person, reaches a point directly opposite on the
\( \mathrm{P} \) other bank of a flowing river, while swimming at a speed of \( 5 \mathrm{~m} / \mathrm{s} \) at an angle of \( 120^{\circ} \) with the flow. The
W speed of the flow must be
(1) \( 2.5 \mathrm{~m} / \mathrm{s} \)
(2) \( 3 \mathrm{~m} / \mathrm{s} \)
(3) \( 4 \mathrm{~m} / \mathrm{s} \)
(4) \( 1.5 \mathrm{~m} / \mathrm{s} \)
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