Question

Naoya read a book cover to cover in a single session, at a rate of 55pages per hour. After reading for 4 hours, he had 330 pages left to read.

Answer 1

If you are answering a question or about how many pages he has in his book, it is 550 pages in his book total. If it's how much longer Naoya will have to read to finish their book it is 10 hours.