A car moves for half of its time at 80 kmh'1 and for rest half of time at 40 kmh'1. The total distance covered is 60 km. What is the average speed of the car?

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A car moves for half of its time at 80 kmh'1 and for rest half of time at 40 kmh'1. The total distance covered is 60 km. What is the average speed of the car?