40K is 24.8 miles. One kilometer equals .62 miles.
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40k is 24.85 miles. 1k equals 0.62 miles. K stands for kilometers which is a metric unit of measurement.
There are 0.62 miles in every 1 kilometer. Therefore, if you multiply 0.62 times the number of kilometers you'd like to convert (20), you will get your answer: 12.4 miles.