Ok a quick google tells me Cheetahs can run as fast as 120km/hr so in order to think of how fast it can run 1km we have can just say that if it can run 120km in 1 hour and we only want 1km thats 1/120th of the distance it can run in an hour
So what is 1/120th of an hour, well 1 hour is 60 mins and 1 min is 60 seconds so 1 hour is 3600 seconds (60×60). Now to get 1/120th of an hour divide 3600 by 120 and you get 30seconds
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