A car driver drives a car with average speed of 40 km/h from plain to a hilly place, on return journey his speed is 20 km/h. The average speed of his car in total covered distance of 400 km is

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A car driver drives a car with average speed of 40 km/h from plain to a hilly place, on return journey his speed is 20 km/h. The average speed of his car in total covered distance of 400 km is






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