Question

An automobile has 20-inch diameter wheels. If the wheels revolved three times after the brakes were applied, the stopping distance was approximately _____.

Answer 1

If the automobile's wheels is 20 inch in diameter. We can compute the circumference by:
Circumference = π* diameter
= 3.14159265359 * 20 inches
≈ 188.5 inches

To get the answer in feet, convert inches to feet:
= 188.5 / 12 ft
= 15.7 ft

The answer is 15.7 ft