document.write( "Question 342301: One pipe fills a pool in 30 min
\n" ); document.write( "Another pipe fills a pool in 20 min
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\n" ); document.write( "\n" ); document.write( "If all 3 were on how long till the pool is filled
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Algebra.Com's Answer #245074 by Alan3354(69443)\"\" \"About 
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One pipe fills a pool in 30 min
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\n" ); document.write( "Another in 10 min\r
\n" ); document.write( "\n" ); document.write( "If all 3 were on how long till the pool is filled
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\n" ); document.write( "The 1st fills 1/30 for the room per minute
\n" ); document.write( "The 2nd 1/20 per minute
\n" ); document.write( "The 3rd 1/10 per minute
\n" ); document.write( "Together, they fill 1/30 + 1/20 + 1/10 per min = 11/60 per minute
\n" ); document.write( "--> 60/11 minutes per room
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