#### Answer

Width: 12 feet, Length: 18 feet

#### Work Step by Step

If the width is x and the length is 6 feet longer than the width, then the length is x + 6. The equation for perimeter is:
P = 2l + 2w
Substituting our values into the equation, we get:
60 = 2(x + 6) + 2x
Solve for x:
60 = 2x + 12 + 2x
60 = 4x + 12
48 = 4x
12 = x
The width is x = 12 feet, and the length is x + 6 = 12 + 6 = 18 feet.