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ntA boy runs for 10 mins at a uniform speed of 9 km/h. At what speed should he run for the next 20 mins so that the average speed comes to 12 km/h?n

Answer» ntA boy runs for 10 mins at a uniform speed of 9 km/h. At what speed should he run for the next 20 mins so that the average speed comes to 12 km/h?n


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