document.write( "Question 287943: one inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. how long will it take the pipe to fill the pool if the drain is left open? \n" ); document.write( "
Algebra.Com's Answer #208665 by Alan3354(69443)\"\" \"About 
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one inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. how long will it take the pipe to fill the pool if the drain is left open?
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\n" ); document.write( "Each hour, 1/4 of the pool is filled and 1/8 is emptied.
\n" ); document.write( "--> each hour, the change = 1/4 - 1/8 = 1/8
\n" ); document.write( "8 hours\r
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