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

Posted by Sai Poreddiwar (Apr 20, 2017 9:21 a.m.) (Question ID: 4959)

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  • 6km/h

    Answered by Md Wasim (Apr 20, 2017 11:30 a.m.)
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