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Math

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If sally can paint a house in 4hrs, and John can paint the same house in 6hrs, How long will it take for both of them to paint the house together?

  • Math -

    Sally's rate = house/4
    Johns rate = house/4

    working together = house/(house/4 + house/6)
    = house/(10house/24)
    = house * 24 10house
    = 24/10 = 2.4

    it will take 2.4 hrs or 2hrs, 24 minutes

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