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March 26, 2017

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if wayne completed a task in one hour and sarah completed a task in two hours, how long will they take if they work together?

  • math - ,

    Every hour Wayne completes 1 task, and Sarah completes (1/2) task (simply take the reciprocal). Together, in 1 hour they will complete 3/2 tasks. Therefore, to complete 1 task, it takes them 2/3 hours.

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