math

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paul paints a house in 4 hours, mike paints the same house in 6 hours. how long will it take them both to paints this house?

  • math -

    paul's rate = house/4
    Mike's rate = house/6
    combined rate = house/4 + house/6
    = 5(house)/12

    time for both = house/(5house/12)
    = 12/5 = 2.4 hours

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