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Kyllä, esim. wikipedia tietää kertoa:

http://en.wikipedia.org/wiki/Marathon

Marathon on siis 26 mailia 385 yardia ja kun maili on 1760 yardia on marathon maileina 26.21875.

Yksi yardi on 3 jalkaa ja yksi jalka vastaa 12 tuumaa ja yksi tuuma on 2.54 cm eli yksi yardi on 36 tuumaa eli 0.9144 m

26 mailia 385 yardia = (26*1760+385) *0.9144 m = 42194,988 m

The choice of distance was somewhat arbitrary. The first modern Olympics in 1896 had a marathon distance of 40 km. The marathon distance at the 1908 Olympic Games in London was extended by 385 yards from its set 26 miles so that the runners would cross the finish line in front of the Royal family's viewing box so the length became 42.195 km (26 miles 385 yards). The distance in this 1908 Olympic Games, based in London, was calculated so that the race could begin at Windsor Castle and end in front of the Royal Box in the Olympic arena. For the next Olympics in 1912, the length was changed to 40.2 km and changed again to 42.75 km for the 1920 Olympics. Of the first 7 Olympic games, there were 6 different marathon distances between 40 and 42.75 km (40 km being used twice).A fixed distance of 42.195 km was adopted in 1921 by the International Amateur Athletic Federation (IAAF) as the official marathon distance

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