Question 757940
Perimeter = 2 x length + 2 x width
Width = x
Length = 5x
   6 miles = 2(5x) + 2(x)
   6 miles = 10x + 2x
   6 miles = 12x
         x = 6/12
         x = 1/2 mile
   Width = 1/2 mile
   Length = 5/2 miles or 2.5 miles
Perimeter = 2 x length + 2 x width
          = 2 x 2.5 + 2 x 0.5
             = 5 miles + 1 mile
                 = 6 miles
Hope this helps.
:-)