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How fast is 139 inches per second?

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It's about one-and-three-tenths times as fast as a Crocodile
In other words, 139 inches per second is 1.3 times the speed of a Crocodile, and the speed of a Crocodile is 0.77 times that amount.
(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 110 inches per second. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 220 inches per second.
It's about one-and-four-fifths times as fast as Michael Phelps
In other words, 139 inches per second is 1.8176 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.55018 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 76.4760 inches per second. 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 half as fast as a Bull
In other words, 139 inches per second is 0.53 times the speed of a Bull, and the speed of a Bull is 1.9 times that amount.
(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)
The herd of the annual Encierro in Pamplona, Spain runs at an average speed of 260 inches per second. The Encierro is run annually from July 7th through July 14th and involves 42 bulls, 77 oxen, and an estimated 17,000 runners over the course of the event.
It's about half as fast as Noah Ngeny
In other words, 139 inches per second is 0.4659 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 2.146 times that amount.
(in Rieti, Italy; 1999) (sprinter; 1978-)
Setting a world record at the Rieti Grand Prix in 1999, Noah Ngeny ran 1,000 m in 2:11.96 for an average speed of 298.30 inches per second. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about two-fifths as fast as Flo-Jo
In other words, 139 inches per second is 0.3767 times the speed of Flo-Jo, and the speed of Flo-Jo is 2.655 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 369 inches per second. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about two-and-a-half times as fast as Walking Pedestrians (in Manhattan)
In other words, 139 inches per second is 2.7 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 0.37 times that amount.
(Manhattan; average speed; 8,978 person-sample)
A 2006 Study by the New York City Department of City Planning found that pedestrians in that city walk at an average rate of 51 inches per second. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 56 inches per second
It's about one-third as fast as Usain Bolt
In other words, 139 inches per second is 0.343 times the speed of Usain Bolt, and the speed of Usain Bolt is 2.92 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 407 inches per second 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.