How far is Metropolis from...erm... Gotham?

I'm sure this isn't the best place to ask, but I figured maybe someone would know.

I'm trying to work things out for my crossover ficathon story -- and the way Elisabeth had set hers (which is my starting point), Lois seems to live and work in Metropolis, but Bruce Wayne is still in Gotham, so I kind of need to figure how long a trip would be for her to get from the Planet to Wayne Manor.

I had her go from one place to the other in a different story, but I couldn't have cared less about the distance between the cities at the time, so I still have no clue - and this time, it affects the plot, so...


Superman: Why is it that good villains never die?
Batman: Clark, what the hell are good villains?
=> Superman/Batman: Public Enemies