Answer:
15ft
Step-by-step explanation:
rectangles have 4 sides. The top and bottom are equal, and the left and right are. If we know that the length of one side is 40 ft, we know the length of the other side is also 40 ft so we subtract 80 from 110. that leaves us with 30. So, the width of each side is equal so we know the width is 15 ft.