Hello!
In order to find the answer to the question, we can begin by converting the measurements into one common unit. In this case, we can convert 0.72km to 720 meters, which will make the final calculation a bit easier.
The formula to find the perimeter of the garden is L2+W2.
The length is 160 meters, so we can multiply this by two to find a portion of the rectangle.
160 x 2 = 320
Now, we can subtract 320 from the total number: 720
720 - 320 = 400
To find the width, we simply now need to divide 400 by 2.

= 200
The width of the garden is 200 meters.
I hope this helps you! Have a wonderful day!
-MMMski