Q.

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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a

10 kmph

b

15 kmph

c

18 kmph

d

12 kmph

answer is D.

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Detailed Solution

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vavg =3v1v2v3v1v2+v2v3+v3v1vavg =3×10×20×6010×20+20×60+60×10
vavg = 18kmph

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