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Equivalents in other units

How fast is 8 kilometers per hour?

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It's about one-and-one-tenth times as fast as Michael Phelps.
In other words, 8 kilometers per hour is 1.144 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.87413 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
It's about four-fifths as fast as a Crocodile.
In other words, 8 kilometers per hour is 0.82 times the speed of a Crocodile, and the speed of a Crocodile is 1.2 times that amount.
(American Crocodile, Crocodylus acutus) (swimming speed)
It's about one-and-seven-tenths times as fast as Walking Pedestrians (in Manhattan).
In other words, the speed of Walking Pedestrians (in Manhattan) is 0.59 times 8 kilometers per hour.
(Manhattan; average speed; 8,978 person-sample)
It's about one-third as fast as a Bull.
In other words, the speed of a Bull is 3 times 8 kilometers per hour.
(for animals involved in the Running of the Bulls, a.k.a. Encierro, San Fermin, Pamplona, Spain) (herd average speed)
It's about three-tenths as fast as Noah Ngeny.
In other words, 8 kilometers per hour is 0.2932 times the speed of Noah Ngeny, and the speed of Noah Ngeny is 3.411 times that amount.
(in Rieti, Italy; 1999) (sprinter; 1978-)
It's about four times as fast as an Iceberg.
In other words, the speed of an Iceberg is 0.3 times 8 kilometers per hour.
(a.k.a. Berg) (Newfoundland iceberg average)
Moved by ocean currents and wind, icebergs can drift at speeds of about 2 kilometers per hour. The largest iceberg ever recorded was a found near Baffin Island, Nunavut and was estimated to be nine billion metric tons.
It's about one-fourth as fast as Flo-Jo.
In other words, 8 kilometers per hour is 0.2371 times the speed of Flo-Jo, and the speed of Flo-Jo is 4.218 times that amount.
(at the Seoul Olympics, 1998) (a.k.a. Florence Griffith-Joyner, a.k.a. Florence Delorez Griffith) (swimmer; 1959-1998)