Posted by kimnlesc on Wednesday, March 17, 2010 at 7:36pm.
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
NICE !!
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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