Question

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?

Answer 1

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