Calculate the average speed of a car running at the rate of 20 km/hour during the first 30 km, at 25 km/hour during the next 30 km and at 30 km/hour during the last 30 km.

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Calculate the average speed of a car running at the rate of 20 km/hour during the first 30 km, at 25 km/hour during the next 30 km and at 30 km/hour during the last 30 km.

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Calculate the average speed of a car running at the rate of 20 km/hour during the first 30 km, at 25 km/hour during the next 30 km and at 30 km/hour during the last 30 km.

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