They run true to size
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Either can be bigger: it is no big deal.
1 hr = 3600 s 1000 m = 1 km speed = distance/time = 50m/10s = 5 m/s = 5 m/s x (3600 s/h) / (1000 m/km) = 18 km/h
a run in math is referring to slope, which is rise over run. rise is how far you travel up, and run is how far you travel over.
If you're talking about slope, it is rise over run. But why is it not the other way run over rise?
there are 36 muscles in a run mile