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How fast is 911 kilometers per hour?

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It's about twelve-and-a-half times as fast as a Greyhound.
In other words, the speed of a Greyhound is 0.0794 times 911 kilometers per hour.
(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 fifteen times as fast as Secretariat.
In other words, 911 kilometers per hour is 15.10 times the speed of Secretariat, and the speed of Secretariat is 0.0662 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, 911 kilometers per hour is 24.450 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.0409 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, 911 kilometers per hour is 24.60 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.0407 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, the speed of Flo-Jo is 0.03704 times 911 kilometers per hour.
(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-thirtieth as fast as The Space Shuttle.
In other words, 911 kilometers per hour is 0.032679 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 30.6010 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.
It's about thirty times as fast as Noah Ngeny.
In other words, 911 kilometers per hour is 33.390 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 0.02995 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.