document.write( "Question 666989: a pipe can fill a tank in 120 minutes, while a drain can drain it in 150 minutes. if the drain is left open and the fill pipe is turned on how long will it take to fill the tub \n" ); document.write( "

Algebra.Com's Answer #414755 by solver91311(24713) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "120 minutes is 2 hours, and 150 minutes is 2.5 hours. I'm going to use hours because the fraction denominators will be smaller. If the fill pipe can fill the tank in 2 hours, then the fill pipe can fill

of the tank in 1 hour, and the drain that drains the whole tank in 2.5 hours can drain

of the tank in 1 hour.\r
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\n" ); document.write( "\n" ); document.write( "Working together, they can fill \r
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\n" ); document.write( "\n" ); document.write( "of the tank in 1 hour.\r
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\n" ); document.write( "\n" ); document.write( "Do the arithmetic, then take the reciprocal of the answer to get the number of hours to fill the tank.\r
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\n" ); document.write( "\n" ); document.write( "John
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\n" ); document.write( "My calculator said it, I believe it, that settles it
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