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  2. Half marathon - Wikipedia

    en.wikipedia.org/wiki/Half_marathon

    A half marathon is a road running event of 21.0975 kilometres (13 miles 192.5 yards)—half the distance of a marathon. [1] It is common for a half marathon event to be held concurrently with a marathon or a 5K race, using almost the same course with a late start, an early finish, or shortcuts. [2]

  3. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    km/h ≡ 1 km/h = 2. 7 × 10 −1 m/s knot: kn ≡ 1 nmi/h = 1.852 km/h = 0.51 4 m/s knot (Admiralty) kn ≡ 1 NM (Adm)/h = 1.853 184 km/h [29] = 0.514 77 3 m/s mach number: M: Ratio of the speed to the speed of sound [note 1] in the medium (unitless). ≈ 340 m/s in air at sea level ≈ 295 m/s in air at jet altitudes metre per second (SI unit ...

  4. 25K run - Wikipedia

    en.wikipedia.org/wiki/25K_run

    The 25K run (25 kilometers, approximately 15.52 miles) is a long distance running footrace that is between the distance of a half marathon and a marathon.It was formerly an official world record distance in road running by World Athletics, [1] but has since been downgraded to world best status.

  5. Half marathon world record progression - Wikipedia

    en.wikipedia.org/wiki/Half_marathon_world_record...

    On 30 March 1991, Arturo Barrios ran a world record distance of 21.101 km in one hour, becoming the first man to run the half marathon distance in under one hour. [11] On 3 April 1993, Moses Tanui became the first man to run a half marathon race in under one hour, with a time of 59:47. [12]

  6. Long-distance running - Wikipedia

    en.wikipedia.org/wiki/Long-distance_running

    Road racing events can be of virtually any distance, but the most common and well-known is the marathon, half marathon, and 10 km run. The sport of road running finds its roots in the activities of footmen : male servants who ran alongside the carriages of aristocrats around the 18th century, and who also ran errands over distances for their ...

  7. Template:Convert/list of units/length - Wikipedia

    en.wikipedia.org/.../list_of_units/length

    Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter: 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter: 1.0 Mm (620 mi) kilometre: km km US spelling: kilometer: 1.0 km (0.62 mi) km mi; hectometre: hm hm US spelling: hectometer: 1.0 hm (330 ft) decametre ...

  8. 21K Buenos Aires - Wikipedia

    en.wikipedia.org/wiki/21K_Buenos_Aires

    The Buenos Aires Half Marathon (official name: 21k Buenos Aires), is an annual road running competition over the half marathon distance 21.0975 kilometres (13.1094 mi) which takes place in Buenos Aires, Argentina in September. The route starts and ends in City Park and winds through the city center.

  9. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    42.195 km Length of a marathon: 10 5: 100 km: 100 km The distance the IAU considers to be the limit to space, called the Karman line: 163 km Length of the Suez Canal, connecting the Mediterranean Sea to the Red Sea: 491 km Length of the Pyrenees, the mountain range separating Spain and France: 600km Thermosphere height 974.6 km