document.write( "Question 713473: A water tank can be filled in 7 minutes and emptied in 10 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank? \n" ); document.write( "

Algebra.Com's Answer #438465 by Edwin McCravy(20056) $\"\"$ $\"About$

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document.write( "The filling rate is one tank per 7 minutes or  or .\r\n" );
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document.write( "The emptying rate is NEGATIVE one tank per 10 minutes or  or .\r\n" );
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document.write( "So the filling rate when both are open is  =  =  = \r\n" );
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document.write( "Set up a proportion\r\n" );
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document.write( "3 tanks is to 70 minutes as 1 tank is to X minutes\r\n" );
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document.write( "Cross multiply and solve for X.\r\n" );
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document.write( "You'll get that it would take  or  minutes 20 seconds. \r\n" );
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document.write( "Edwin

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