document.write( "Question 714932: a pool can be filled by one pipe in 5 hours and by a second pipe in 6 hours. How long will it take using both pipes to fill the pool? \n" ); document.write( "
Algebra.Com's Answer #439047 by checkley79(3341)\"\" \"About 
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1/5+1/6=1/x
\n" ); document.write( "(6+5)/5*6=1/x
\n" ); document.write( "11/30=1/x cross multiply.
\n" ); document.write( "11x=30
\n" ); document.write( "x=30/11
\n" ); document.write( "x=2.73 hours ans.
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