Answer:
[tex]\begin{equation*} 241\text{ mi}^2 \end{equation*}[/tex]
Step-by-step explanation:
The range of a data set is the difference between the greatest area and the smallest area, then for the Eastern and Western respectively:
[tex]\begin{gathered} Eastern\text{ cities:} \\ Range=\text{ 305-90} \\ Range=215\text{ mi}^2 \end{gathered}[/tex][tex]\begin{gathered} Western\text{ cities:} \\ Range=503-47 \\ Range=456\text{ mi}^2 \end{gathered}[/tex]
Then, find the difference between the range for the cities in the west and the cities in the east;
[tex]456-215=241\text{ mi}^2[/tex]