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A caer travelled the first third of a di...

A caer travelled the first third of a distance (x) at a speed of `10 km//h`, the second third at a speed of ` 20 km//h` and the last third at a speed of ` 60 km//h`. Determine the average speed of the car over the entire distance (x).

Text Solution

Verified by Experts

`v_(1)=10` km ph, `v_(2)=20` km ph,
`v_(3)=60` km ph, v = ?
`3/v=1/v_(1)+1/v_(2)+1/v_(3)`
`3/v=1/10+1/20+1/60, 3/v=(6+3+1)/60=3/v=10/60`
`therefore v=18` km ph
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