A motor vehicle travelled the first third of a distance s at a speed of v1 = 10 kmph, the second third at a speed of v2 = 20 kmph and the last third at a speed of v3 = 60 kmph. Determine the mean speed of the vehicle over the entire distance s.

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15 kmph

12 kmph

10 kmph

18 kmph

answer is D.

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