They are riding bikes and based on the riding scenes averaging 8-10 mph stopping occasionally to literally smell the flowers. This goes on for several days so they should be 144-180 miles from where they started. There are three sloppy, fat, tubs of lard following them on foot and somehow can track their direction when they ride bicycles over asphalt. They stop frequently to look for clues as to what direction they went so at that walking speed they should be 18-36 miles from where they started which is the same location as the pair and somehow the three fat guys walking end up on the same path way ahead of the pair on bicycles. Now I understand you have to suspend belief on movies for the movie to work but when it's a major part of the plot is that utterly stupid it's just not possible and whoever directed this should be banned from making movies because you cause people to waste an hour of their life on this nonsense.
Review of After the End
