My question is: 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? Your thoughts:
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. The final answer: 15.