document.write( "Question 935129: one pipe can fill a pool in 6 hours. The drain can empty the whole pool in 12 hours. With a pipe on the drain open, how long would it take the pool to be filled \n" ); document.write( "
Algebra.Com's Answer #568261 by TimothyLamb(4379)\"\" \"About 
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r = w/t
\n" ); document.write( "t = w/r
\n" ); document.write( "---
\n" ); document.write( "rates are additive:
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\n" ); document.write( "r = 1/6 - 1/12
\n" ); document.write( "t = 1/r
\n" ); document.write( "t = 1/(1/6 - 1/12)
\n" ); document.write( "t = 12 hours
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