document.write( "Question 1055872: A water faucet can fill a sink in 15 minutes, whereas the drain can empty it in 6 minutes.
\n" ); document.write( "If the sink is full, how long will it take to empty if both the faucet and the drain are open?
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Algebra.Com's Answer #671041 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
Another constant rates situation much as if doing a job, doing a quantity of work.\r
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\n" ); document.write( "\n" ); document.write( "RT=V, here, volume unit is just for 1 SINK.\r
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\n" ); document.write( "\n" ); document.write( "\"%281%2F15%29t-%281%2F6%29t=-1\"
\n" ); document.write( "The negative 1 for the amount of volume is because I have taken FILLING to be POSITIVE, and EMPTYING to be NEGATIVE.
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