How would I figure out how much a mile would be to an ant?

I was out on a hike with my girlfriend when I noticed a long chain of ants. They were carrying their eggs from one ant hole to another, about ten feet apart. It appeared as if they were moving their colony. It made me think about when I had to move across the country before. I wondered how far their move was relative to when I moved.

How would I go about figuring that out?