document.write( "Question 886043: A tank is filled in 9 hrs. and drained in 11 hrs. How long will it take to fill the tank if the drain is left half open. \n" ); document.write( "

Algebra.Com's Answer #535701 by Edwin McCravy(20056) $\"\"$ $\"About$

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document.write( "A tank is filled in 9 hrs. \r\n" );
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document.write( "So the fill rate is 1 tank per 9 hrs or\r\n" );
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document.write( " or ,\r\n" );
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document.write( "and the drain rate is -1 tank per 11 hrs or\r\n" );
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document.write( " or .\r\n" );
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document.write( "Since the drain is only half open, it's rate is halved\r\n" );
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document.write( " or \r\n" );
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document.write( "Their combined rate is  or\r\n" );
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document.write( "since \r\n" );
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document.write( "their combined fill rate is \r\n" );
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document.write( "Suppose it takes x hours.  Then\r\n" );
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document.write( "  \r\n" );
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document.write( "Edwin

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