document.write( "Question 69796: a mason can make a wall in 6 hours. His helper takes 9 hours. In how many hours can they make the wall together. \n" ); document.write( "

Algebra.Com's Answer #49733 by checkley75(3666) $\"\"$ $\"About$

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6*9/(6+9)=54/15=3.6 HOURS TO COMPLETE THE WALL WORKING TOGETHER
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