Today's interview question comes courtesy of one of my co-workers:

Suppose you have 3 walkways in an airport. One of them goes from the entrance to the gates, and the other goes from the gates to the exit. Which direction would you want the 3rd to move?

You don't have to know anything else about this airport in order to get at the response I'm looking for-- so it has nothing to do with if the airport is a hub, where the baggage claim is, or anything else.