Checking your speedometer. A common way to check the accuracy of your speedometer is to drive one or more measured (not odometer) miles, holding the speedometer at a constant 60 miles per hour and checking your watch at the start and end of the measured distance.
a. How does your watch show you whether the speedometer is accurate? What mathematics is involved?
b. Why shouldn't you use your odometer to measure the number of miles?
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