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How fast is 8 kilometers per hour?

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It's about three-tenths as fast as Noah Ngeny
In other words, 8 kilometers per hour is 0.29320 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 3.4110 times that amount.
(in Rieti, Italy; 1999) (sprinter; 1978-)
Setting a world record at the Rieti Grand Prix in 1999, Noah Ngeny ran 1,000 m in 2:11.96 for an average speed of 27.28 kph. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about one-fourth as fast as Flo-Jo
In other words, 8 kilometers per hour is 0.23710 times the speed of Flo-Jo, and the speed of Flo-Jo is 4.2180 times that amount.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
Setting a world record in 1988, Flo-Jo ran a 200 m in 0:21.34 for an average speed of 33.74 kph. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
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).