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 2.5 inches would represent 2.5 * 8 = <<2.5*8=20>>20 miles.
Therefore, the cities are 20 miles apart in reality.