The perimeter of a rectangle is:
Perimeter = 2L + 2W
Where L is the Length and W is the Width. The problem tells you that the Perimeter = 372 m and the Width = 88 m. Plug those given values into the equation:
372 = 2L + 2(88)
372 = 2L + 176
Solve for L. The units are meters (m).