Answer:
350 miles
Step-by-step explanation:
Set up a proportion where x is the actual distance between City C and D:
[tex]\frac{250}{1.5}[/tex] = [tex]\frac{x}{2.1}[/tex]
Cross multiply and solve for x:
1.5x = 525
x = 350
So, the actual distance between City C and City D is 350 miles