Answer :
- Length of rectangle = 75 feet
Explanation:
Let us consider the width of the rectangle be 'x' feet and length be '5x' feet .
Also the perimeter of the rectangle is 180 feet

where, l is length and w is width



Divide both sides by 12,

Hence, width of rectangle = x = 15 feet



Henceforth, the length of the rectangle is 75 feet.