document.write( "Question 1192357: A water tank can be filled in 9 hours and then drained in 12 hours. How long would it take to fill the water tank if the drain is left open? \n" ); document.write( "

Algebra.Com's Answer #824253 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "A water tank can be filled in 9 hours and then drained in 12 hours.
\n" ); document.write( "How long would it take to fill the water tank if the drain is left open?
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document.write( "Filling  rate is    of the tank volume per hour.\r\n" );
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document.write( "Draining rate is    of the tank volume per hour.\r\n" );
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document.write( "The net filling rate is the difference   =  = .\r\n" );
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document.write( "Hence, the tank will be filled in 36 hours, if the drain is left open.\r\n" );
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