Explanation:
Let the width of the rectangular plot be x then the length will be 4x.
Perimeter of the rectangular plot = 360m
We know that,
Perimeter = 2*(l + b) where l=length and b = breadth
360 = 2*(4x+x)
or, 360= 2* 5x
or, 360 =10x
or, x = 36
Hence the width = x = 36m
And the length = 4x
= 4*36
=144m