Austin runs 3.6 km and makes 40 rounds in his circle shaped gym. What is the diameter of gym? (π=3)

3.6 km / 40 rounds = 0.09 km per round.

0.09 km x 1000 m/km = 90 meters

The circumference of the circle is 90 meters

Using 3 as pi as told, divide the circumference by 3 to get the diameter:

Diameter = 90 meters / 3 = 30 meters