the scale on a map is 1 inch represents 8 miles. if two cities are 2 1/2 inches apart on the map, how far are they in reality?

If 1 inch represents 8 miles on the map, then 2 1/2 inches represent:

2 1/2 inches * 8 miles/inch = <<2.5*8=20>>20 miles

Therefore, the two cities are 20 miles apart in reality.