fast
Would depend on leg length, fitness, and how hard they're trying. Most peoplewould be able to to walk at 3 MPH.
As an average 300 m (altitude) in one hour.
2 miles per hour
Most adults can run at about 7 mph in a short distance. That would be at top speed. If the same person ran a mile it would probably take about 30 to40 minutes depending if they are tired or fully...