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Equivalents in other units

How fast is 123 inches per hour?

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It's about one-seventy-fifth as fast as a Sloth.
In other words, the speed of a Sloth is 77 times 123 inches per hour.
(for Brown-throated three-toed sloth, Bradypus variegatus)
It's about one-five-hundredth as fast as an Iceberg.
In other words, the speed of an Iceberg is 500 times 123 inches per hour.
(a.k.a. Berg) (Newfoundland iceberg average)
It's about one-one-thousand-five-hundredth as fast as Walking Pedestrians (in Manhattan).
In other words, the speed of Walking Pedestrians (in Manhattan) is 1,500 times 123 inches per hour.
(Manhattan; average speed; 8,978 person-sample)
It's about one-two-thousandth as fast as Michael Phelps.
In other words, 123 inches per hour is 0.00044676 times the speed of Michael Phelps, and the speed of Michael Phelps is 2,238.3 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
It's about one-three-thousandth as fast as a Crocodile.
In other words, 123 inches per hour is 0.00032 times the speed of a Crocodile, and the speed of a Crocodile is 3,100 times that amount.
(American Crocodile, Crocodylus acutus) (swimming speed)
It's about one-seven-thousand-five-hundredth as fast as a Bull.
In other words, the speed of a Bull is 7,700 times 123 inches per hour.
(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 940,000 inches per hour. 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 one-eight-thousand-five-hundredth as fast as Noah Ngeny.
In other words, 123 inches per hour is 0.0001145 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 8,734 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 1,074,000 inches per hour. According to some reports, Ngeny did not begin running competitively until just three years before setting the record.