Multiple choice general knowledge science & technology To the nearest mile, what is the length of the marathon? 18 miles 100 miles 26 miles 6 miles Reveal answer Fill a bubble to check yourself C Correct answer Explanation A marathon is 26.2 miles (42.195 kilometers). This distance was standardized at the 1908 London Olympics, when the course was extended to finish under the royal nursery at Windsor Castle. To the nearest mile, this rounds to 26 miles.