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How fast is 859.4 kilometers per hour?

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It's about twelve times as fast as a Greyhound.
In other words, 859.4 kilometers per hour is 11.9 times the speed of a Greyhound, and the speed of a Greyhound is 0.084 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 fourteen times as fast as Secretariat.
In other words, 859.4 kilometers per hour is 14.2 times the speed of Secretariat, and the speed of Secretariat is 0.0704 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 twenty times as fast as Michael Johnson.
In other words, 859.4 kilometers per hour is 23.06 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.04337 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 twenty times as fast as Usain Bolt.
In other words, 859.4 kilometers per hour is 23.2 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.0431 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 thirty times as fast as Flo-Jo.
In other words, 859.4 kilometers per hour is 25.47 times the speed of Flo-Jo, and the speed of Flo-Jo is 0.03926 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 thirty times as fast as Noah Ngeny.
In other words, 859.4 kilometers per hour is 31.5 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 0.03175 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-thirtieth as fast as The Space Shuttle.
In other words, 859.4 kilometers per hour is 0.030828 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 32.438 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 27,877 kph. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.