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A boy runs for 20 min. at a uniform speed of 18km/h. At what speed should he run for the next 40 min. so that the average speed comes 24km/hr.
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The boy should run with a speed of 27 km/h for next 40 minutes. The distance is the product of the speed and time. Now, The average speed is equal to the total distance divided by total time. Hence, The boy should run with a speed of 27 km/h for next 40 minutes.
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