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100 kilometers per hour is about one-and-two-fifths times as fast as a Greyhound.
In other words, it's 1.380 times the speed of a Greyhound, and the speed of a Greyhound is 0.7250 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 72.4 kph. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
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