Explanation:
This is asking you to write a speech. If you need to learn how to write a formal speech, I would suggest you to look that up, as I am not knowledgeable on the topic. However, I can tell you what you need to put.
Utilize excerpts or other transcripts of the two books, Life on The Mississippi, and the auto biography of Frederick Douglass, and treat this as if it was a compare and contrast essay, whilst still confining to the formats of a formal speech. This is also a bit of an informational speech, so I would suggest trying to mix the two category's techniques.
When you're writing and you think you're finished, read it out and time yourself. If you're under 5 minutes, then you need to lengthen it.