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it takes janet 9 hours to do a task and it take jancie 10 hours to do the same task how long will it take both of them to do the task together

  • math -

    janet rate: 1task/9hrs
    jancie rate: 1task/10hrs

    combinded rate=1task/hr (1/9+1/10)

    timecombined=1task/combinded rate

    careful with the fractions.

  • math -

    5 hrs

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