Length = 60 feet
Perimeter = 220 feet
There's four sides to a rectangle if one side is 60 then that means there are two sides that 60 because they are opposite each other.
So side A=60 and side B = 60
Now you have two sides left. Add the two sides you have to get 120
Subtract 120 from 220 = 100
Now divide 100 by 2 to get the remainder side lengths which is 50
So side C=50 and side D=50
Area is base times height so in this case it would be 50 times 60 since those are adjacent sides
And your answer is 3000 feet
Hope this helped!