A car travelled the first one-third of the distance d at a speed of 20 kmh−1, the second one-third of the distance at a speed of 40 kmh−1 and the last one-third of the distance at a speed of 120 kmh−1. Determine the average speed of the car.

A car travelled the first one-third of the distance d at a speed of 20

1.	A car travelled the first one-third of the distance d at a speed of 20 kmh−1, the second one-third of the distance at a speed of 40 kmh−1 and the last one-third of the distance at a speed of 120 kmh−1. Determine the average speed of the car.
Answer» A car travelled the first one-third of the distance $d$ at a speed of $20 k m h^{- 1}$ , the second one-third of the distance at a speed of $40 k m h^{- 1}$ and the last one-third of the distance at a speed of $120 k m h^{- 1}$ . Determine the average speed of the car.

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A car travelled the first one-third of the distance d at a speed of 20 kmh−1, the second one-third of the distance at a speed of 40 kmh−1 and the last one-third of the distance at a speed of 120 kmh−1. Determine the average speed of the car.

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