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Bob and Ken are painting a room. If Bob paints the room alone, he can finish the job in 4 hours. If Ken paints it alone, he can finish the job in 6 hours. How long will it take them to paint it together?

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Bob and Ken are painting a room. If Bob paints the room alone, he can finish the job in 4 hours. If Ken paints it alone, he can finish the job in 6 hours. How long will it take them to paint it together?






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