You can put this solution on YOUR website! If you go 12.8 seconds around a 3/8 mile , how fast are you going in mph ?
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rate = distance/time
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rate = (3/8)mile/((12.8/3600) hrs)
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rate = (3/8)*(3600/12.8) mph
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rate = 105.47 mph
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Cheers,
Stan H.