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Extra Credit opportunity:

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.]

  • math -

    Hint:
    Not all towns are directly beside a highway.

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