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A man can swim with a speed of $4 \mathrm{kmh}^{-1}$ in still water. How long does he take to cross a river $1 \mathrm{~km}$ wide, if the river flows steadily $3 \mathrm{kmh}^{-1}$ and he makes his strokes normal to the river current?
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The correct answer is:
15 min
As the man swims across the river making normal strokes. So, the time taken to cross the river is independent of the river flow.
$\begin{aligned} \therefore \text { Time } & =\frac{\text { Distance }}{\text { Speed }}=\frac{1}{4}=0.25 \mathrm{~h} \\ & =15 \mathrm{~min}\end{aligned}$
$\begin{aligned} \therefore \text { Time } & =\frac{\text { Distance }}{\text { Speed }}=\frac{1}{4}=0.25 \mathrm{~h} \\ & =15 \mathrm{~min}\end{aligned}$
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