Tom paints a room that has 5 walls. Each wall is 2 meters by 3 meters. John can paint 1 square meter every 10 minutes. He has 10 hours to paint everything. How many hours does he have to spare? Let's answer step by step:
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Each wall is 2 * 3 = 6 square meters. So each wall takes 6 * 10 = 60 minutes to paint. So it takes 60 / 60 = 1 hour to paint each wall. That means in total it takes 5 * 1 = 5 hours to paint. So he has 10 - 5 = 5 hour left after finishing painting. The answer: 5.
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