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A car A is travelling from west at 50 km...

A car A is travelling from west at 50 km/hr and car B is travelling towards north at 60 km//hr . Both are headed for the intersection of the two roads . At what rate are the cars approaching each other when car A is 0.3 kilometers and car B is 0.4 kilometers from the intersection ?

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The correct Answer is:
`(1)/(0.5)[0.3(-50)+40(-60)] =-78 km//hr`.
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