document.write( "Question 1129103: A new type of pump can drain a certain pool in 9 hours. An older pump can drain the pool in 11 hours. How long will it take both pumps working together to drain the pool? \n" ); document.write( "
Algebra.Com's Answer #745644 by josgarithmetic(39617)\"\" \"About 
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\"1%2F9%2B1%2F11\" pool per hours\r
\n" ); document.write( "\n" ); document.write( "\"11%2F99%2B9%2F99\"\r
\n" ); document.write( "\n" ); document.write( "\"20%2F99\"\r
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\n" ); document.write( "\n" ); document.write( "\"HOURS%2FPOOL\":\r
\n" ); document.write( "\n" ); document.write( "\"99%2F20\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%284%2619%2F20%29\" \"hours\"
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