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Suzy can paint a house in 4 hours. Peter can paint the same house in 6 hours. How long will it take to paint the house if they painted it together?

  • math - ,

    I solve these by the following:
    1 house/4 hours = 0.25 house/hr.
    1 house/6 hours = 0.157 house/hr.

    If they paint together they will have those combined or
    0.25 house/hr + 0.167 house/hr = 0.417 house/hour.
    or 1/0.417 hours/house = 2.4 hours.

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