A man can paint a room by himself in 8 hours and it takes his son 12
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A man can paint a room by himself in 8 hours and it takes his son 12 hours to do the same job. The man works by himself for three hours, then his son joins him and the two together complete the job. How long does the son work?
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ISBN: 978-0321986498
4th edition
Authors: Richard D. De Veaux, Paul D. Velleman, David E. Bock
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