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How fast is 68 times the speed of light?

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It's about 2,000,000,000 times as fast as Usain Bolt
In other words, 68 times the speed of light is 1,980,000,000 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.000000000505 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 0.00000003450 times the speed of light 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 2,000,000,000 times as fast as Flo-Jo
In other words, 68 times the speed of light is 2,175,000,000 times the speed of Flo-Jo, and the speed of Flo-Jo is 0.0000000004598 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 0.000000031260 times the speed of light. Known as a 200 m runner, Joyner also set a record time in a 100 m race at in 1987.
It's about 2,500,000,000 times as fast as Noah Ngeny
In other words, 68 times the speed of light is 2,690,000,000 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 0.0000000003717 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 0.000000025280 times the speed of light. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.
It's about 3,000,000,000 times as fast as a Bull
In other words, 68 times the speed of light is 3,000,000,000 times the speed of a Bull, and the speed of a Bull is 0.00000000033 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 0.0000000220 times the speed of light. 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 7,500,000,000 times as fast as a Crocodile
In other words, 68 times the speed of light is 7,600,000,000 times the speed of a Crocodile, and the speed of a Crocodile is 0.00000000013 times that amount.
(American Crocodile, Crocodylus acutus) (swimming speed)
An American crocodile can reach speeds in the water of up to 0.00000000930 times the speed of light. On land, larger crocodiles can "gallop" when fleeing danger at speeds of up to 0.0000000190 times the speed of light.
It's about 10,000,000,000 times as fast as Michael Phelps
In other words, 68 times the speed of light is 10,495,000,000 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.000000000095283 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 0.00000000647950 times the speed of light. 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 15,000,000,000 times as fast as Walking Pedestrians (in Manhattan)
In other words, 68 times the speed of light is 16,000,000,000 times the speed of Walking Pedestrians (in Manhattan), and the speed of Walking Pedestrians (in Manhattan) is 0.000000000063 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 0.00000000430 times the speed of light. Pedestrians wearing headphones, the study went on to find, walk at a slightly faster 0.00000000470 times the speed of light