In the figure shown a river of width \( 4 \mathrm{~km} \) is flowing with the speed of \( 5 \mat...

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In the figure shown a river of width \( 4 \mathrm{~km} \) is flowing with the speed of \( 5 \mathrm{~km} / \mathrm{h} \). A swimmer whose swimming speed relative to the water is \( 4 \mathrm{~km} / \mathrm{h} \), starts swimming from a point \( A \) on a bank. On the other \( \operatorname{bank} B \) is a point which is directly opposite to \( A \). What minimum distance (in \( \mathrm{km} \) ) the swimmer will have to walk on the other bank to reach the point \( B \).
(A) 2
(B) 3
(C) 4
Figure \( 1.142 \)
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