Two ships are \( 10 \mathrm{~km} \) apart on a line from south to north. The one farther north i...

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Two ships are \( 10 \mathrm{~km} \) apart on a line from south to north. The one farther north is moving towards west at
P
\( 40 \mathrm{kmph} \) and the other is moving towards north at 40
W
\( \mathrm{kmph} \). Then distance of their closest approach is
(1) \( 10 \mathrm{~km} \)
(2) \( 10 \sqrt{2} \mathrm{~km} \)
(3) \( \frac{10}{\sqrt{2}} \mathrm{~km} \)
(4) \( 20 \mathrm{~km} \)
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