Extra Credit opportunity:

Question

A driver is headed north on a long, straight highway and sees this sign:
Nearville 150 miles
Farville 160 miles

Then, surprisingly, an hour later she sees this apparently inconsistent sign on the same highway:
Nearville 100 miles
Farville 109 miles

How can this be possible? [The signs are correct; the terrain is flat; neither town moves its boundary; there is no change in route.]

Answer 1

Hint:
Not all towns are directly beside a highway.