An automobile tire is rated to last for 45,000 miles. Estimate the number of revolutions the tire will make in its lifetime.

Answer 1

Dia. = 20in.

1rev = 3.14 * 20 = 62.8in = 5.2ft.

45000mi * 5280ft/mi * (1/5.2)rev/ft =
45,692,308.rev.