Gon a one-mile circular automobile race track, 30 drivers are each instructed to drive one lap (i. e., one mile) at 60 mph, the next lap at 90 mph, and then continue to alternate between lap speeds of 60 and 90 mph for a very long period of time. to visualize this system, you might imagine that the cars are inserted onto the race track in such a way that cars in each speed class maintain nearly uniform spacings over the track. determine