A car travels from A to B at 30 kmph and from B to A at 20 kmph. Average speed is : ?->(Show Answer!)

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A car travels from A to B at 30 kmph and from B to A at 20 kmph. Average speed is : ?->(Show Answer!)

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1. A car travels from A to B at 30 kmph and from B to A at 20 kmph. Average speed is :

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