document.write( "Question 469706: A pump can fill a swimming pool in 8 hours. The pool also has a drain that can empty the pool in 10 hours. If someone turns on the pump to fill the pool, but forgets to shut the drain, how long would it take for the pool to fill? \n" ); document.write( "
Algebra.Com's Answer #322229 by jorel1380(3719)\"\" \"About 
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1/8-1/10=1/t
\n" ); document.write( "5/40-4/40=1/t
\n" ); document.write( "1/40=1/t
\n" ); document.write( "t=40 hours to drain the pool..
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