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Length. For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200⁄3937 m (approximately 0.304 8006 m ). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd ...
From 1630 to 1718 a millia was 5,564 feet (1,696 metres), making a geographical league of four millias equal 22,256 feet (6,784 m or 3.663 modern nautical miles). But from 1718 through the 1830s the millia was defined as the equivalent of just over 5,210 feet, giving a shorter geographical league of just over 20,842 feet (6,353 m or 3.430 ...
The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of length; both are based on the older English unit of length equal to 5,280 English feet, or 1,760 yards. The statute mile was standardised between the Commonwealth of Nations and the United ...
The marathon is referred to as a 26.219-mile race (the official marathon standard distance originally being in English units—26 miles, 385 yards) rather than 42.195 km. Ultramarathons are measured in either miles or kilometers, with little standardization either way.
At exactly four laps of a normal 400 m track, this distance is raced as a near replacement for the mile (it is, in fact, 9.344 m, about 30.6 feet, shorter; however, it is still colloquially referred to as "the mile"). The 1600 meters is the official distance for this range of races in US high schools. While this race is rarely run outside high ...
Caeleb Dressel holds the most world swimming records in men's swimming with six (four individual and two relays). Katie Ledecky holds the most individual world records in women's swimming with four. The world records in swimming are ratified by World Aquatics (formerly known as FINA), the international governing body of swimming.
The marathon (from Greek Μαραθώνιος) is a long-distance foot race with a distance of 42.195 km (26 mi 385 yd), [ 1] usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair divisions.
kilometre (km) or kilometer is a metric unit used, outside the US, to measure the length of a journey; the international statute mile (mi) is used in the US; 1 mi = 1.609344 km. nautical mile is rarely used to derive units of transportation quantity.