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Two vehicles leave the same place P at t...

Two vehicles leave the same place P at the same time moving along two different roads. One vehicle moves at an average speed of 60km/hr and the other vehicle moves at an average speed of 80km/hr. After half an hour the vehicle reach the destinations A and B. If AB subtends `60^(@)` at the initial point. P, then find AB.

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The correct Answer is:
`20sqrt(13)km`
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