A ship A is moving Westwards with a speed of 10 \( \mathrm{km} / \mathrm{h} \) and a ship B \( 1...

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A ship A is moving Westwards with a speed of 10 \( \mathrm{km} / \mathrm{h} \) and a ship B \( 100 \mathrm{~km} \) South of A, is moving Northwards with a speed of \( 10 \mathrm{~km} / \mathrm{h} \). The time
\( \mathrm{P} \)
after which the distance between them becomes
W
shortest is
(1) \( 5 \mathrm{~h} \)
(2) \( 5 \sqrt{2} \mathrm{~h} \)
(3) \( 10 \sqrt{2} \mathrm{~h} \)
(4) None of these
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