document.write( "Question 1131672: One inlet pipe can fill an empty pool in 6 hours, and a drain can empty the pool in 10 hours. How long will it take the pipe to fill the pool if the drain is left open? \n" ); document.write( "
Algebra.Com's Answer #748343 by josgarithmetic(39617)\"\" \"About 
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Filling is taken (or could) as positive. Draining or emptying can then be taken as NEGATIVE filling.\r
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\n" ); document.write( "\n" ); document.write( "Filling Rate using both pipes at the same time:
\n" ); document.write( "\"1%2F6-1%2F10\"\r
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\n" ); document.write( "\n" ); document.write( "\"5%2F30-3%2F30\"\r
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\n" ); document.write( "\n" ); document.write( "\"2%2F30\"\r
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\n" ); document.write( "\n" ); document.write( "\"1%2F15\"\r
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\n" ); document.write( "\n" ); document.write( "15 hours to fill
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