Answer:
The length is 15 miles and the width is 5 miles.
Step-by-step explanation:
The rectangle has two dimensions, width w and length l.
The area is given by the following formula:
.
In this problem, we have that:
The width is 10 miles less than its length. This means that
The area is 75 square miles. So
.
and .
We cannot have negative dimensions. This means that the length is 15 miles and the width is 5 miles.