Average 4458

The first third of the track was driven by a car at a speed of 15 km/h, the second third at a speed of 30 km/h, and the last third at a speed of 90 km/h. Find the average speed of the car.

Correct answer:

v =  27 km/h

Step-by-step explanation:

v=3/(1/15+1/30+1/90)=27 km/h

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