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About 10 minutes at average walking speed of 9km/h
The time it takes to walk 8.1 km depends on the individual's walking speed. On average, a person walks at a speed of about 5 km/h, so it would take approximately 1.62 hours to walk 8.1 km at this pace. To calculate the time more precisely, divide the distance by the walking speed: 8.1 km / 5 km/h = 1.62 hours.
18.75 km / hr.
You divide the distance by the time. If the time is in seconds, the average speed will be in meters/second. Multiply this by 3.6 if you want to have it in km/hour.
The average speed is 110 km per hour.