The length of the rectangular section is 120 m, and the width is 3 times less. Find the perimeter of the area.

The perimeter of a rectangle is twice the sum of its length and width.
Formula: P (rectangle) = 2 * (a + b), where a is the length of the rectangle and b is the width of the rectangle.
The solution of the problem:
The first step is to find the width of a rectangular area:
120/3 = 40 (meters).
The second step is to find the perimeter of a rectangular area:
P (rectangle) = 2 * (120 + 40) = 2 * 160 = 320 (meters).
The correct answer to the problem: the perimeter of a rectangular section is 320 meters.