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A ship A is moving Westwards with a spe...

A ship A is moving Westwards with a speed `10 kmh ^(-1)` and a ship B 100 km South of A , is moving Northwards with a speed of `10km^(-10)`. The time after which the distance between them becomes shortest is :

A

5h

B

`5 sqrt2 h`

C

`10 sqrt2 h`

D

0

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