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Two roads OA and OB intersect at an angl...

Two roads OA and OB intersect at an angle `60^(@)`. A car driver approaches O from A, where OA = 800 metres, at a uniform speed of 20 m/sec. Simultaneasly, O runner starts running from O towards B at uniform speed of 5 m/sec. Find the time when the car and the runner are closest.

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The correct Answer is:
`(240)/(7)` second.
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