Before Will Smith and Gene Hackman make it to the convenience store, Smith find Hackman in a parking lot in his El Camino in DC and tells him to let him in. They talk for a few minutes and Hackman says he's hungry. So they go to the convenience store in Balitmore and Will makes a call and is traced by Jack Black and find them in Baltimore. Well all the NSA agent chasing them were in DC and when they get to the convience store they ask for the surveillance tapes for the past 20 minutes. And for a fact, DC to Balitmore takes 1 hour without traffic, even driving like maniacs, they would never make it to Baltimore in 20 minutes.