document.write( "Question 854113: a pool can be filled by one pipe in 20 hours and by a second pipe 60 hours. How long ? \n" ); document.write( "
Algebra.Com's Answer #514507 by richwmiller(17219)\"\" \"About 
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How long? very long!
\n" ); document.write( "How long is what? the pipe?
\n" ); document.write( "How long to drain the pool?
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