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A vehicle covers first half of its total...

A vehicle covers first half of its total distance at a speed 20 kmph. and the other half of the distance at 40 kmph. The mean speed over the entire distance.

A

30 kmph

B

50 kmph

C

`40/3` kmph

D

`80/3` kmph

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Verified by Experts

The correct Answer is:
D
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