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If it takes painter # 1 three hours to paint a house, and painter # 2 eight hours to paint a house, how long would it take them if they work together?

  • Math -

    #1's rate = house/3
    #2's rate = house/8
    combined rate = house/3 + house/8
    = 11house/24

    so time for combined effort = house/(11house/24)
    = 24/11 hours

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