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Worker A can complete a task in 7 hours while worker B can complete the same task in 9 hours. How long (in hr) would it take the workers to complete the task together? (Enter an exact number as an integer, fraction, or decimal.)

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Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
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ISBN: 9780395977224
Author: Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher: McDougal Littell
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