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Math help again...

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My teacher gave me this weird math problem and I'm not sure what I have to figure out or how I need to figure it out...What the heck does this mean?...

Adam was standing in his front yard at the time of the accident, making a video of his little sister riding her bike for the first time. Later while viewing the video tape Adam abserved that the accident was recorded in the background of the videotape. He timed his sister's preformance to be 15 seconds long. Then by running the videotape in slow motion, he was able to count the 24-inch diameter tires of Johns truck rotating 101 times while Adams sister rode the bike.