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To measure the speed of a moving car, all you have to do is use a stopwatch and clock how long it takes the car to go exactly one mile.... If it's 60 seconds, then it's going 60 mph; if its 75 secs, 75mph, etc... If you can only see it for a half mile, just double the time on the stopwatch and you'll get the correct speed, a quarter mile, multiply times 4, etc.

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