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Two cars A and B are moving west to east...

Two cars `A and B` are moving west to east and south to north, respectively, along crossroads. A moves with a speed of `20 m s^-1` and is `500 m` away from the point of intersection of cross roads and `B` moves with a speed of `15 ms^-1` and is `400 m` away from the point of intersection of cross roads. Find the shortest distance between them.

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`20 m`
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