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18 March, 02:16

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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  1. 18 March, 05:22
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    He will need to boost up his speed by 20 mph in order to get the avrege which is 60 mph
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