question: Every 2 miles a car drives the tires rotate 725 times.  Jeremy drives 400 miles a month.  If each tire can undergo 10,440,000 rotations how many years before the tire needs to be replaced?
answer: Jeremy drives 400/2=<<400/2=200>>200 segments of 2 miles
  That means each month the car undergoes 200*725=<<200*725=145000>>145,000 rotations
  So the tire can last for 10,440,000/145,000=<<10440000/145000=72>>72 months
  That means the tires will last 72/12=<<72/12=6>>6 years
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