So, I measured out 2000m^2.
That's 2km.
I then timed how fast it took for my Hearthling to run the distance... 36 seconds.
That's 18 seconds per km, approximately.
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We want to fit it so that 18km/second becomes 18sec/km.
1 / 18 = 0.055
(1 mile takes 18 seconds)
So how far do we run of that one mile, in 18 seconds? 0.055 km/sec
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0.055 * 60 = 3.3km/minute
0.055 * (60*60) = 198 km/hour
That's right folks, Hearthlings run at 198 km/hour. I think.
Correct me if I'm wrong, It's quite late...
... Then wolfram Alpha said this:
http://www.wolframalpha.com/input/?i=18 ... +per+km%3F