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A t-rex ran at an average speed of 40 km/h.

Usain Bolt's top speed (for the last 100 metres of a race) was 44.72 km/h (his average speed for that famous 2009 race was around 37 km/h).

That means that if he only had to run 100 metres, Usain Bolt could outrun a t-rex.

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