5 meters per second.
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If you run 2.5 miles in 20 minutes your average speed is 7.5 miles per hour.
Speed = Distance/Time = 5 metres per second
If you run 6 miles in 20 minutes, then you run 1/6th the mileage (1 mile) in 1/6th the time (1/6 x 20/1) 20/6 = 3 2/6 minutes = 3 1/3 minutes = 3 minutes 20 seconds 1 mile = 3 minutes 20 seconds
You divide 400m by 20s to get: 400 m / 20 s = 20 m/s (which is a moderate speed for a vehicle)
20 feet in 0,5 seconds ==> 40 feet per second 40 feet per second * 3 seconds = 120 feet