document.write( "Question 1140553: A new type of pump can drain a certain pool in 6 hours. An older pump can drain the pool in 14 hours. How long will it take both pumps working together to drain the pool ? \n" ); document.write( "
Algebra.Com's Answer #761092 by Alan3354(69443)\"\" \"About 
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6*14/(6+14) = 4.2 hours \n" ); document.write( "
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