1.

A boy runs for 10 min at a uniform speed of 9 km/h. At what speed should be run for the next 20 min, so that the average speed comes to 12 km/h?

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A boy runs for 10 min at a uniform speed of 9 km/h. At what speed should be run for the next 20 min, so that the average speed comes to 12 km/h?



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