Problem:

In a drawing of a Missouri map, the distance across, which is actually 240 miles, is represented by 4 inches.

Find the scale factor that is used, and then determine the distance on the map going from north to south if the actual distance is 420 miles.

Answer:

Scale factor = 240 miles/4 inches = 60 miles per inch

420 miles/60 miles per inch = 7 inches

So the distance for 420 miles in the drawn map is 7 inches