The scale of the map is 1 centimeter = 15 kilometers, which we can write as the following unit rate.
15 kilometers/1 centimeter
By multiplying this unit rate by 2.5, we get the number of kilometers that corresponds to 2.5 centimeters on the map.
15 kilometers* 2.5/1 centimeter* 2.5=37.5 kilometers/2.5 centimeters
As we can see, the actual distance is 37.5 kilometers.
