How Far Is Gotham City From Metropolis?

After Meredith asked whether Bruce Wayne was going to show up in Smallville, certain commenters wondered just how long a trip that would be. That's not the easiest question to answer, considering the entirely fictional nature of both Gotham City and Superman's hometown. Not that that's going to stop us taking a stab… » 7/03/08 7:30am 7/03/08 7:30am