Given:
A map shows some cities in the northern United States. The scale of a map is

The actual distance between Chicago, IL and Pittsburgh, PA is 375 miles.
We need to determine the distance between the two cities on the map.
Distance between the two cities:
The distance between the two cities on the map can be determined by dividing the actual distance by 125 miles.
Thus, we have;

Dividing the terms, we get;

Thus, the distance between the two cities on the map is 3 inch.