There are a lot of solutions to this problem, so I'm only going to list 10. The only requirement is that the quadrilateral must be a rectangle with a perimeter of 120 meters.
1) 30, 30, 30, 30. I know that this is a square, but it should still be a solution since all squares are rectangles.
2) 50, 50, 10, 10.
3) 55, 55, 5, 5.
4) 45, 45, 15, 15.
5) 40, 40, 20, 20.
6) 35, 35, 25, 25.
7) 36, 36, 24, 24.
8) 18, 18, 52, 52.
9) 14, 14, 48, 48
10) 6, 6, 54, 54.
