Question

The scale on the map says that 1.5 cm represents 40 miles. On the map the measurement between Nashville, TN and Atlanta, GA is 12 cm. Which proportion could be used to find the distance between these two cities?

Answer 1

Divide 12  by 1.5 so you have a number you can directly multiple with 40. 
12/1.5 = 8
The multiple 8 by 40 to get the number of miles.
8(40) = 320