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

the answer is 2 hrs and 24 min. How did they come up with that?

  • math - ,

    In twelve hours, sally can paint 3, and john 2, or five houses together.

    combined rate=5houses/12hours

    1house=rate*time=5/12 * time
    time= 12/5 hrs

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