Question

the tread on an automobile tire is initially 0.5 cm thick. the tire is safe to drive on as long as it has atleast 0.2 cm of tread. under normal driving conditions this tire is guaranteed for 50 000 km. assuming that the guaranteed has been computed so that only 1% of tires will actually have to be replaced under the guarantee, estimate how much tread wears off of the tire per revolution assuming the diameter of the tire is 1meter

Answer 1