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How fast is 55 kilometers per hour?

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It's about nine-tenths as fast as Secretariat.
In other words, 55 kilometers per hour is 0.909 times the speed of Secretariat, and the speed of Secretariat is 1.1 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 four-fifths as fast as a Gazelle.
In other words, the speed of a Gazelle is 1 times 55 kilometers per hour.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
It's about four-fifths as fast as a Hare.
In other words, the speed of a Hare is 1 times 55 kilometers per hour.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
It's about three-fourths as fast as a Greyhound.
In other words, the speed of a Greyhound is 1.32 times 55 kilometers per hour.
(a.k.a. English greyhound) (approximate maximum speed)
It's about one-and-a-half times as fast as Michael Johnson.
In other words, 55 kilometers per hour is 1.476 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.6775 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
It's about one-and-a-half times as fast as Usain Bolt.
In other words, 55 kilometers per hour is 1.48 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.676 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
It's about one-and-three-fifths times as fast as Flo-Jo.
In other words, 55 kilometers per hour is 1.63 times the speed of Flo-Jo, and the speed of Flo-Jo is 0.6135 times that amount.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)