Problem 5. Rectangle $ABCD$ is composed of three congruent rectangles (see drawing). If the perimeter of each of these rectangles is $60 \mathrm{~cm}$, what is the area of the square that has the same perimeter as rectangle $ABCD$?

![](https://cdn.mathpix.com/cropped/2024_06_05_1b044dba0a21c223c4c1g-2.jpg?height=228&width=271&top_left_y=251&top_left_x=1191)