A map has a scale where 1 inch represents 20 miles. If two cities are 4.5 inches apart on the map, what is the actual distance between them in miles?
✓ Correct Answer: Option D
Set up a proportion: 1 inch / 20 miles = 4.5 inches / x miles. Cross-multiply to solve for x: x = 4.5 * 20 = 90 miles.