Final answer:
The literary devices used in the given passage are a simile and hyperbole, comparing silence to an elastic and exaggerating the distance to the books.
Step-by-step explanation:
The passage "There was more silence than she ever thought possible. It extended like an elastic, dying to break. The girl broke it... the books were miles away" uses a simile and hyperbole as literary devices. A simile is a direct comparison between two unlike things using 'as' or 'like', which is seen in the comparison of silence extending like an elastic. Hyperbole is an exaggerated statement that is not meant to be taken literally, which is applied to the idea that books were miles away, exaggerating the distance to express a strong emotion or point.