Answer: 1 inch= 25 miles
Explanation:
Given : The actual distance from Washington to Fairview is 250 miles.
On a map, the distance from Washington to Fairview is shown as 10 inches.
It means , 10 inches on map shows 250 miles.
Applying unitary method, 1 inch on map will show =

i.e 1 inch on map will show =

Hence, the map’s scale is 1 inch= 25 miles.