You need to attach an image of the passage so I can read it.
Answer:
a sentence that contains a misplaced modifer
Explanation:
the sentence contains a misplaced/dangling modifier. the phrase, <em>sailing into the harbor, </em>modifies something unclearly stated in the sentence.
Hello!
"Quickly" is an adverb since it is describing the verb, "sped."
It answers the question "how did it speed?" - It sped <em>quickly</em>.
