document.write( "Question 1183385: Hello\r
\n" ); document.write( "\n" ); document.write( "A pipe can empty a tank in 40 minutes.
\n" ); document.write( "A second pipe with diameter twice as much as
\n" ); document.write( " that of the first is also attached with the tank to empty it.\r
\n" ); document.write( "\n" ); document.write( "The two pipes together can empty the tank in 8
\n" ); document.write( "minutes.\r
\n" ); document.write( "\n" ); document.write( "I don't understand how they got 8?\r
\n" ); document.write( "\n" ); document.write( "How would I go about solving this?\r
\n" ); document.write( "\n" ); document.write( "Thanks in advance,\r
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Algebra.Com's Answer #813707 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "I think math_helper is right. \r\n" );
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document.write( "Edwin
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