Question

The warranty on a new tire says that an automobile can travel for a distance of 102,000 km before the tire wears out. The radius of the tire is 0.35 m. How many revolutions does the tire make before wearing out?

Answer 1

The length of tire circumference is L = 2πr = 2*3.14*0.35 = 2.198 m. So, the tire makes
N =& 102000*1000/2.198 = 46405823,5 revolutions before wearing out.