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?
1 answer:
to average 60 mph for 2 laps his total speed needs to equal 60 x 2 = 120
his first lap was 40 so his 2nd lap needs to be 120-40 = 80 mph
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