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Yan can read two pages in 3 minutes. At this rate, how long will it take him to read a 360-page book?
9 hours.
30 minutes.
2 hours.
6 hours.
Detailed Explanation
Using the ratio pages/minutes, the proportion \(\frac{\mathrm{2} }{\mathrm{3}}\) = \(\frac{\mathrm{360} }{\mathrm{x}}\) can be used to find the time.
Cross multiply. 2x = 3 × 360, so 2x = 1,080 and x =1080 ÷ 2 = 540 minutes. Convert minutes to hours.
There are 60 minutes in 1 hour so 540 ÷ 60 = 9 hours.
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