Final answer:
The length of the rectangular fence is 40 ft.
Step-by-step explanation:
To find the length of the rectangular fence, we need to use the formula for the perimeter of a rectangle: P = 2L + 2W, where P is the perimeter, L is the length, and W is the width. Since the perimeter is given as 200 ft and the width is 60 ft, we can substitute these values into the formula and solve for L.
200 = 2L + 2(60)
200 = 2L + 120
2L = 200 - 120
2L = 80
L = 80/2
L = 40
The length of the enclosure is 40 ft.
Learn more about rectangle perimeter