360 miles if they are in a straight line from each other, but probably more due to road directional changes. 4 1/2 inches is "As the Crow flies".
1 inch = 80 milesdistance=9/2x80milesit gives 720/2i.e 360
80 miles x 4 inches = 320 miles
1/2 inch left
1/2 of 80 = 40 miles
320 + 40 = 360 miles total
1/2 inch left
1/2 of 80 = 40 miles
320 + 40 = 360 miles total
80X4=320+40=360