Anyone us mapmyride?

I started using mapmyride to track my rides to and from work. I like it a lot, but don't know what one of the stats means.
Any one know what the minute speed means here? Is it just average speed per minute?

Hmmm? Don't know how to add a pic from my phone, but there is a screen that overlays speed on top of elevation with avg, max and minute speeds listed.

Thanks, if anyone can explain this