1.

A ship A is moving Westwards with a speed of10 km h-1 and a ship B, 100 km South of A, ismoving Northwards with a speed of 10 km h1.The time after which the distance between thembecomes shortest, is:[AIPMT 2015](1) 5 h(2) 5/2 h(3) 10/2 h(4) 0 h

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