Averages (about): 5 yrs: 20 min. 7 yrs: 15-20 min. 10 yrs: 10 min. 12 yrs: 12 min. 15 yrs: 10 min. 20 yrs: 7-10 min. 30 yrs: 12 min. 40 yrs: 10-20 min. 50 yrs: 15-25 min. 60 yrs: 15-25 min. 70 yrs: 20 min. 80 yrs: 20-35 min. Based on a person who could run a mile in 10 min. at age 11-12, or at age 30 could do an oliptical for at least 10 min. or at age 60 could walk a mile in 20 min.
A 6-minute mile is fast and long for an average American human being.
about 1,000 mile per hour, dude
I presume you mean how long will it take for a 12 miles bike ride. It depends on how fast you can bike, if it's uphill or downhill. The average is between 8-13 mph for most people to bike on a 10-speed on the whole. By that measurement, it could take 50-90 minutes or so on the average.
21.75 miles per hour
The average square mile of a city can vary widely depending on the city's population density and geographic size. Larger cities like New York City may have a higher average square mile due to their dense urban areas, while smaller cities may have a lower average square mile.
500,000
10
They have an "average" speed. Definitely not as fast as a Quarter horse at the Quarter mile, nor as fast as a Thoroughbred at the 1-1.5 mile range nor as fast as an Arabian over long distances. But, know there are always exceptions to the "average" rule.
A quarter mile in 10.6 seconds = about 85 mph average speed.
5 minutes, 30 seconds
A 14-minute mile equates to an average speed of 4.3 miles per hour.
Could be anything between 5-10 MPH.