gyuriana gyuriana

16-08-2016
Mathematics

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A test driver has to drive a car on a 1-mile track for two rounds in a way, that his average speed is 60 mph. On his first round his average speed is 40 mph. How fast does he need to drive, to get the right speed average?

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alissiaf alissiaf

16-08-2016

240two hundred fourty

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