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How fast is 347.90 yards per hour?

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It's about one-one-hundredth as fast as Flo-Jo.
In other words, 347.90 yards per hour is 0.009429 times the speed of Flo-Jo, and the speed of Flo-Jo is 106.10 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 36,900 yards per hour. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about one-one-hundredth as fast as Usain Bolt.
In other words, 347.90 yards per hour is 0.00858 times the speed of Usain Bolt, and the speed of Usain Bolt is 117 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 40,700 yards per hour 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-one-hundredth as fast as Michael Johnson.
In other words, 347.90 yards per hour is 0.008538 times the speed of Michael Johnson, and the speed of Michael Johnson is 117.10 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 40,760 yards per hour 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-two-hundredth as fast as Secretariat.
In other words, 347.90 yards per hour is 0.00526 times the speed of Secretariat, and the speed of Secretariat is 190 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 66,100 yards per hour in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about one-two-hundred-fiftieth as fast as a Greyhound.
In other words, the speed of a Greyhound is 227 times 347.90 yards per hour.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 79,200 yards per hour. 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-two-hundred-fiftieth as fast as a Gazelle.
In other words, the speed of a Gazelle is 300 times 347.90 yards 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 90,000 yards per hour. 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-two-hundred-fiftieth as fast as a Hare.
In other words, the speed of a Hare is 300 times 347.90 yards 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 80,000 yards per hour. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.