document.write( "Question 436643: A pool can be filled with one pipe in 8 hours, whereas a second pipe requires 20 hours to fill the
\n" ); document.write( "pool. How long would it take to fill the pool with both pipes turned on?
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Algebra.Com's Answer #312684 by richwmiller(17219)\"\" \"About 
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x/8+x/20=1
\n" ); document.write( "x/2+x/5=4
\n" ); document.write( "5x+2x=40
\n" ); document.write( "7x=40
\n" ); document.write( "x=40/7 hours
\n" ); document.write( "x=5 5/7 hrs
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