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A motor vehicle travelled the first thir...

A motor vehicle travelled the first third of a distance s at a speed of `v_1`=10 kmph, the second third at a speed of `v_2`=20 kmph and the last third at a speed of `v_3`=60 kmph. Determine the mean speed of the vehicle over the entire distance s.

A

15 kmph

B

12 kmph

C

10 kmph

D

18 kmph

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The correct Answer is:
D
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AAKASH SERIES-MOTION IN A STRAIGHT LINE -EXERCISE -II
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