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algebra

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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?

  • algebra -

    Sally can paint 3 houses in 12 hours.

    John can paint 2 houses in 12 hours.

    Together they can paint 5 houses in 12 hours.

    12/5 = 2.4 hours per house

  • algebra -

    NICE !!

  • algebra -

    Sally paints a house in four hrs or .25house per hour
    John paints house in 6 hrs or one in .166hrs
    If they worked together .25+.166= .416 house per hour or,
    1/.416= 2.4 hrs per house

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