A motor vehicle travelled the first third ofa 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_(1)=60 kmph. Determine the mean speed of the vehicle over the entire distance s.

A motor vehicle travelled the first third ofa distance s at a speed of

1.	A motor vehicle travelled the first third ofa 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_(1)=60 kmph. Determine the mean speed of the vehicle over the entire distance s.
Answer» 15 kmph 12 kmph 10 kmph 18 kmph Answer :D