The speedometer in Kevin’s car reads in both miles/hour and kilometers/hour. What information is needed to convert between these two units?

To convert a speed from miles per hour to kilometers per hour, you need the distance conversion between miles and kilometers. Specifically, knowing how many miles are in 1 kilometer lets you convert the distance unit while keeping the time unit, hours, unchanged. The needed information is “the number of miles in 1 kilometer.”

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