document.write( "Question 453460: if it take 4 hours to fill a pool with the drain closed and 5 hours to empty a pool with the drain open, how long does it take to fill a pool with the drain open \n" ); document.write( "

Algebra.Com's Answer #311552 by nerdybill(7384) $\"\"$ $\"About$

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if it take 4 hours to fill a pool with the drain closed and 5 hours to empty a pool with the drain open, how long does it take to fill a pool with the drain open.
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\n" ); document.write( "Let x = time (hours) it takes to fill pool w/drain open
\n" ); document.write( "then
\n" ); document.write( "x(1/4 - 1/5) = 1
\n" ); document.write( "multiplying both sides by 20:
\n" ); document.write( "x(5 - 4) = 20
\n" ); document.write( "x(1) = 20
\n" ); document.write( "x = 20 hours
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