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If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

  • math -

    In 12 hours, Sally paints 3
    in 12 hours, John paints 2

    so the together rate is 5 houses/12 hrs

    so together 12hrs/5houses= 2.4 hrs/house

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