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A bust traveling along a straight highwa...

A bust traveling along a straight highway covers one third of the total distance between two plces with a velocity `20m km h^(-1)` . The remaining part of the distance was coverd with a velocity of `30 km h^(-1)` for the first half of the remaining time and with velocity `50 km h^(-1)` for the next half on the time. Find the average velocity of the bus for its whole journery.

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`30 km h^(-1)`
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