posted by Henry .
The “average” driver drives ~15,000 miles per year. Let’s assume ~10,000 miles of that is interstate driving. Using your models from parts (b) and (c) again, how much does the average driver spend per year if their average speed is 55 mph, 65 mph, and 75 mph?
15K/10K and then plug in the mph?
I have no idea what the "model" uses.