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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 second half at `60 kmh^(-1)` Calculate the average speed of the car.

A

`40km//h`

B

`48km//h`

C

`50km//h`

D

`60km//h`

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