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How fast is 391 meters per hour?

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It's about one-eighty-fifth as fast as Flo-Jo.
In other words, 391 meters per hour is 0.01159 times the speed of Flo-Jo, and the speed of Flo-Jo is 86.28 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 33,740 meters 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-ninety-fifth as fast as Usain Bolt.
In other words, the speed of Usain Bolt is 95.2 times 391 meters per hour.
(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 37,200 meters 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-ninety-fifth as fast as Michael Johnson.
In other words, 391 meters per hour is 0.01049 times the speed of Michael Johnson, and the speed of Michael Johnson is 95.33 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 37,270 meters 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-one-hundred-fiftieth as fast as Secretariat.
In other words, 391 meters per hour is 0.00646 times the speed of Secretariat, and the speed of Secretariat is 155 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 60,400 meters per hour in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about one-two-hundredth as fast as a Greyhound.
In other words, 391 meters per hour is 0.0054 times the speed of a Greyhound, and the speed of a Greyhound is 185 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 72,400 meters 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-hundredth as fast as a Gazelle.
In other words, the speed of a Gazelle is 200 times 391 meters 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 80,000 meters 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-hundredth as fast as a Hare.
In other words, the speed of a Hare is 200 times 391 meters 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 70,000 meters 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.