Why do they split up, Huck with the king, and the duke separately? (CH 20-23)

After dinner, they go into a nearby town to see what luck will bring them. The men find the town deserted, as everyone has gone to a revival meeting. The Duke breaks into a printer's shop and takes orders from some farmers. He collects cash and promises to print advertisements in the paper. In his final project, he makes a handbill showing a runaway slave and describing Jim. He tells the others that this handbill will make it seem as if they are taking Jim back to collect the reward. The King goes to the revival meeting with Huck and chances upon a crowd being listening to the preacher.