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A motorist travels from A to B at a speed of $40 km / hr$ and returns back at a speed of $60 km / hr$ . His average velocity will be

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$Zero$

$48 km / hr$

$50 km / hr$

$40 km / hr$

answer is D.

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Detailed Solution

$V e l o c i t y = \frac{D i s p l a c e m e n t}{T i m e}$

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