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How fast is 18 feet per second?

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It's about four-fifths as fast as a Bull
In other words, 18 feet per second is 0.820 times the speed of a Bull, and the speed of a Bull is 1.20 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 22 feet 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 seven-tenths as fast as Noah Ngeny
In other words, 18 feet per second is 0.7240 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 1.3810 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 24.860 feet per second. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about three-fifths as fast as Flo-Jo
In other words, 18 feet per second is 0.58540 times the speed of Flo-Jo, and the speed of Flo-Jo is 1.7080 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 30.750 feet 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 half as fast as Usain Bolt
In other words, 18 feet per second is 0.5330 times the speed of Usain Bolt, and the speed of Usain Bolt is 1.880 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 33.90 feet 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.
It's about half as fast as Michael Johnson
In other words, 18 feet per second is 0.53010 times the speed of Michael Johnson, and the speed of Michael Johnson is 1.8860 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 33.970 feet per second 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 two times as fast as a Crocodile
In other words, the speed of a Crocodile is 0.50 times 18 feet per second.
(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 9.10 feet per second. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 18 feet per second.
It's about three times as fast as Michael Phelps
In other words, 18 feet per second is 2.82440 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.354060 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 6.3730 feet 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.