Answer:
Walk quickly until you’re past the houses, then run for the raft as if you were being chased.
Step-by-step explanation:
This is the sentence that best expresses the advise of the duke in modern English. He tells Huck that the best way to get away from the crowd is to walk fast until he has passed all the houses, and then run for the raft as fast as he can, as if someone was chasing him. The fact that the duke does not speak in standard English contributes to enhancing the setting of the story.