Question: 2 data points for a race track are measured. when the cars are all bunched together the speed is 2 0 mph and the density

2 data points for a race track are measured. when the cars are all bunched together the speed is 20 mph and the density is 100 veh/mi. After a while the cars spread out and the speed measured is as 250 mph and there's 5 veh/mi density.
Assuming that Greenshields model applies, What is the FFS? Jam density?

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