document.write( "Question 447040: Can someone help me with this?\r
\n" ); document.write( "\n" ); document.write( "A tank can be filled in 15 hours by pipe A alone and in 30 hours by pipe B alone. How long will it take to fill the tank if both pipes are working?\r
\n" ); document.write( "\n" ); document.write( "Thanks
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Algebra.Com's Answer #307811 by jorel1380(3719)\"\" \"About 
You can put this solution on YOUR website!
1/15+1/30=1/x
\n" ); document.write( "2x+1x=30
\n" ); document.write( "3x=30
\n" ); document.write( "x=10 hours to fill the tank with both pipes working..
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