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How fast is 8 kilometers per hour?

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It's about one-fifth as fast as Usain Bolt.
In other words, 8 kilometers per hour is 0.2160 times the speed of Usain Bolt, and the speed of Usain Bolt is 4.630 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 37.2 kph at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
It's about one-fifth as fast as Michael Johnson.
In other words, 8 kilometers per hour is 0.21470 times the speed of Michael Johnson, and the speed of Michael Johnson is 4.6580 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 37.27 kph at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about one-tenth as fast as Secretariat.
In other words, 8 kilometers per hour is 0.1320 times the speed of Secretariat, and the speed of Secretariat is 7.580 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 60.4 kph in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about one-tenth as fast as a Greyhound.
In other words, 8 kilometers per hour is 0.1110 times the speed of a Greyhound, and the speed of a Greyhound is 9.01 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 72.4 kph. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about one-tenth as fast as a Gazelle.
In other words, the speed of a Gazelle is 10 times 8 kilometers per hour.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 80 kph. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about one-tenth as fast as a Hare.
In other words, the speed of a Hare is 10 times 8 kilometers per hour.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 72 kph. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about one-fifteenth as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 14 times 8 kilometers per hour.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 110 kph. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.