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A tank can be filled by one pipe in 45 minutes and by another pipe in 55 minutes. How long would it take both to fill it?

Mr. Housenecht can do a piece of work in two and a half days and Mr. Warwick in three and one-third days. In how many days can both do it?

Mr. Mann can lay a walk in 6 days, and Mr. Gregory in 8 days. How long will it take Mr. Mann alone to finish the job after both have worked 3 days?

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