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A person, who can swim with speed \( u \) relative to
\( \mathrm{P} \) water, wants to cross a river (of width \( d \) and water is

W flowing with speed \( v \) ). Minimum time in which the person can do so is
(1) \( \frac{d}{v} \)
(2) \( \frac{d}{u} \)
(3) \( \frac{d}{\sqrt{v^{2}+u^{2}}} \)
(4) \( \frac{d}{\sqrt{u^{2}-v^{2}}} \)
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