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jose can complete the job in a hours, and Maria can complete the job in b hours. How long does it take them to complete the job when they work together? I need a formula

  • Algebra -

    Jose's rate = job/a
    Maria's rate = job/b
    combined rate = job/a + job/b
    = job(a+b)/(ab)

    combined time = job/combined rate
    = job/[job(a+b)/(ab)]
    = ab/(a+b)

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