John can read a book 60% faster than his brother. If his brother takes 8 hours to read a book, how long would it take John to read 3 books? Let's think first. Chain of thought:
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Reading 60% faster means John's brother takes 1 + .6 = 1.6 times as long as John to read. So John reads a book in 8 / 1.6 = 5 hours. So it would take John 5 * 3 = 15 hours to read 3 books.
Therefore, the answer is 15.
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