document.write( "Question 1010359: Sam can stain his deck in 9 hours. His sister Grace can stain the deck in 12 hours. How many hours will it take them to stain the deck if they work together? \r
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Algebra.Com's Answer #625766 by josgarithmetic(39615)![]() ![]() ![]() You can put this solution on YOUR website! The sum of their rates is their combined rate. Reciprocal of this rate is the time for \"staining his deck\".\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Sam stains his deck at the rate \n" ); document.write( "Grace stains the deck at the rate of |