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Two ships are 10 km apart on a line runn...

Two ships are 10 km apart on a line running south to north. The one further north is steaming west at 40 km/(hr). The other is steaming north at 40 km/(hr). What ts their distance of closest approach and how long do they take to reach it ?

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`[10/sqrt2 Km, 1/8 hr.]`
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