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Q.

A ship A is moving Westwards with a speed of 10 km h−1 and a ship B  100 km South of A is moving northwards with a speed of 10 km h−1 . The time after which the distance between them becomes shortest is

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a

0 h

b

5 h

c

52h

d

102h

answer is B.

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Detailed Solution

VAB=102 kmph Displacement of A relative to B when they are closest is 1002kmtime t=100/2102=5 h .
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