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I'm thinking about training for a marathon. A marathon is 26.2 miles or 42 kilometers. Although some marathons differ in their terrain (some are very flat, some are extremely hilly) and degree of difficulty, the distance is always 26.2 miles. Races that are shorter or longer in distance have different names (such as 5K, 10K, half-marathon, or ultra-marathon).
Best Answer: The correct answer to your question is this. 1.6 kilometers equal 1 mile. 5 kilometers equal 3.1 miles. 10 kilometers equal 6.2 miles. a marathon always 26.2 miles and a half marathon is 16.1 miles.Source(s): I have run each one of these races many different times. 5k run is 5 kilometers (3.11 mi), and a 10k would be 10 Kilometers (6.21 mi). A marathon is 42.195 kilometres (26 miles 385 yards) and a half marathon is 21.0975 kilometers, or 13 7/64 miles, about 13.1 miles.