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How fast is 390,000 inches per hour?

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It's about as fast as a Crocodile.
(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 390,000 inches per hour. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 790,000 inches per hour.
It's about one-and-two-fifths times as fast as Michael Phelps.
In other words, 390,000 inches per hour is 1.4166 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.70592 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 275,310 inches per hour. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
It's about two times as fast as Walking Pedestrians (in Manhattan).
In other words, 390,000 inches per hour is 2.1 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 0.48 times that amount.
(Manhattan; average speed; 8,978 person-sample)
It's about two-fifths as fast as a Bull.
In other words, 390,000 inches per hour is 0.41 times the speed of a Bull, and the speed of a Bull is 2.4 times that amount.
(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)
It's about one-third as fast as Noah Ngeny.
In other words, 390,000 inches per hour is 0.3631 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 2.754 times that amount.
(in Rieti, Italy; 1999) (sprinter; 1978-)
It's about three-tenths as fast as Flo-Jo.
In other words, 390,000 inches per hour is 0.2936 times the speed of Flo-Jo, and the speed of Flo-Jo is 3.406 times that amount.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)
It's about one-fourth as fast as Usain Bolt.
In other words, 390,000 inches per hour is 0.267 times the speed of Usain Bolt, and the speed of Usain Bolt is 3.75 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)