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The mile is a British imperial unit and US customary unit of distance, based on the older English unit of length equal to 5,280 English feet, or 1,760 yards. The Great Wall of China is a staggering 13,171 miles long.
The kilometre, or kilometer in American English, is a unit of length in the metric system, equal to one thousand metres. Many people know a marathon race is 26.2 miles long but did you know that a marathon is 42.195 in kilometres?