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A car covers the first half of the dista...

A car covers the first half of the distance between two places at a speed of `40 kmh^(-1)` and the second half at`60 kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh ^(-1)`.what is the average speed of the car ?

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The correct Answer is:
`48 kmh ^(-1)`
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