Question 134600
You did absolutely everything correctly up until you said 50 times 8.0 is 400 MILES.  For that to be true, they would have to be running at speeds of 7.5 and 8.0 MILES per second, that is to say 27,000 miles per hour (Mach 35.5) and 28,800 miles per hour (Mach 40) -- compare to Earth gravity escape velocity of a little over 25,000 miles per hour.


I suspect that the 7.5m/s and 8.0m/s actually mean 7.5 and 8.0 METERS per second, hence 50 seconds time 8.0 meters per second = 400 meters -- once around the track and about par for a human runner.