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A man in a row boat must get from Point \( A \) to point \( B \) on the opposite bank of the river as shown in figure-1.163. The
\( \mathrm{P} \) distance \( B C=a \). The width of the river \( A C=b \). At what minimum

W speed \( u \) relative to the still water should the boat travel to reach the point \( B \) ? The velocity of flow of the river is \( v_{0} \).
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