Isn't that slightly overstating it? Those pairs of cities are over 1000 miles apart, so unless you walk at 6mph, that's more than 700x as far.

Overstatement is an understatement! Between the first and second, I remember becoming so sleepy that I couldn't reason through the terms.

It's off by a factor of 8ish, which I applied to turn 2mph from a rate into a smaller unit of time but failed to balance.

It should have been an hour's walk (~2 miles) versus 700 hours' (~1400 miles).