SOLUTION: If 1000 articles of a given type can be turned out by first machine in 10 hours, by a second machine in 7 hours, and by a third in 6 hours, how long will it take to turn out the ar
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Question 1168769: If 1000 articles of a given type can be turned out by first machine in 10 hours, by a second machine in 7 hours, and by a third in 6 hours, how long will it take to turn out the articles with all machines working?
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