This is a personal thing, you need to know how fast on average that you run. This is best done by averaging how long you run in say 5 or a 10 mile session and record the time.
This should take a 9-12 year old to run a mile is 6-9 min.
9mins
well im 19 (and male) and today I did a mile in 6 minutes, bang on.
3.4 centimeters per year, so multiply that by one mile or one kilometer (0.6 of a mile)
9:30
Around 10 minutes
6 min.
8 to 10 minutes.
8 nanoseconds if ur the flash of course
A little but not much.
Age only plays a small fraction on the running speed of a male. The important factor is how healthy they are.
I would guess about 20 minutes.