How fast do you have to run to run a mile in 20 minutes?

It's actually extreme difficult to "run" a mile in 20 minutes. Most people can walk a mile in around 18 minutes, and that's at a fairly leisurely pace. A brisk walk will do it even faster. Until you get down to around maybe 12 minute/mile pace, you're likely not "running." Anyway, unless injured, disabled, etc., you should be able to complete a mile within 20 minutes. Walking.

You can not possible run that slow you will have to walk most of the way.

3 miles per hour...but that's not running. Its walking.

Nooo a 8-10 min mile is a GOOD running mile. It takes 15 min to walk a mile if you are walking a relatively fast pace. 20 min mile.. Well that's walking relatively slow...

I am a pretty bad runner but I run the mile in like 12 mins 20 min is like walking really slow

Actually to cover a mile in 20 minutes you'd have to walk and pretty slowly at that.

A mile in 20 minutes is a brisk walk, not running.

A mile in 20 minutes is 3 miles per hour, which is an easy walking pace for most people. So, one would not run, but instead walk a mile in 20 minutes.

I can walk 2 miles in 20 minutes