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How fast is 390,000 inches per hour?

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It's about one-fourth as fast as Michael Johnson
In other words, 390,000 inches per hour is 0.26590 times the speed of Michael Johnson, and the speed of Michael Johnson is 3.7610 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 1,467,000 inches 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 six times as fast as an Iceberg
In other words, the speed of an Iceberg is 0.20 times 390,000 inches per hour.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 70,000 inches per hour. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about one-fifth as fast as Secretariat
In other words, 390,000 inches per hour is 0.1640 times the speed of Secretariat, and the speed of Secretariat is 6.10 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 2,380,000 inches per hour 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, 390,000 inches per hour is 0.1370 times the speed of a Greyhound, and the speed of a Greyhound is 7.30 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 2,850,000 inches 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-tenth as fast as a Gazelle
In other words, the speed of a Gazelle is 10 times 390,000 inches 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 3,000,000 inches 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-tenth as fast as a Hare
In other words, the speed of a Hare is 10 times 390,000 inches 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 3,000,000 inches 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.
It's about one-tenth as fast as a Knuckleball (baseball)
In other words, the speed of a Knuckleball (baseball) is 11 times 390,000 inches per hour.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 4,300,000 inches per hour. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.