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A motor car covers (1)/(3) part of tota...

A motor car covers `(1)/(3)` part of total distance with velocity `v_(1) = 10 "km.h"^(-1)` , the second `(1)/(3)` part with velocity `v_(2) = 20 "km.h"^(-1)` and the rest with velocity `v_(3) = 60"km.h"^(-1)`. What is the average speed of the car?

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The correct Answer is:
18 km. `h^(-1)`
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