How Many Miles to Babylon?

How many miles to Babylon?
Three score and ten.
Can I get there by candlelight?
Aye, and back again.
If your feet are nimble and light,
You’ll get there by candlelight.

History:

A score is a group of 20 (as in Lincoln’s 4 score and 7 years ago [87 years]) and 10 is 30 miles. We don’t know when the journey starts so hard to tell if it can be done. At 2.8mph (average walking speed) it would take almost 11 hours to make the trip.