No-one is or can be certain exactly how fast T-Rex was.
By measuring the distance between fossilised footprints (up to 4 metres) of T-Rex, knowing the size and length of its fossilised leg and foot bones, and by estimating how much muscle it had on its legs, scientists used to believe the T-Rex could run around 36-40 km/hr.
More recently though the T-Rex's speed has slowed! Some scientists have sugested it's speed to be only about 24 km/hr, others even slower at 14-15 km/hr. T-Rex had a long thigh bone, was very large and heavy, its front arms were tiny and more-or-less useless, and a very large part of its brain was used for smelling. These say that the T-Rex was probably a scavenger and not a predator or hunter. It could smell things up to 35 kms away and then walk or run slowly to a real predator's kill...
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