A typical walking speed is ~2.8-3.5mph – about 17-22 minutes per mile, but this can vary tremendously based on the physical condition f someone. For someone that is very obese, 2-2.5mph might be a more typical walking speed. The people that normally walk very briskly might normally walk 4mph, which would get you a 15 minute mile, but faster than that is going to be uncommon, unless they walk fast for exercise or race walk (At which point the world record pace at the 20km distance works out to be a pace a bit above six minutes/mile).
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