A square is divided into five congruent rectangles, as shown. If the perimeter of each of these five rectangles is 36 inches, what is the perimeter of the square, in inches?

Let the side lengths be x and y units.

x+y+x+y36

2x+2y=36

x+y=18

y=5x

6x=18

x=3

15*4=60..