document.write( "Question 956278: An inlet pipe on a swimming pool can be used to fill the pool in 18 hours. The drain pipe can be used to empty the pool in 20 hours. If the pool is 1/4 filled and then the inlet pipe and drain pipe are opened, how long from that time will it take to fill the pool? Help, setting up equation \n" ); document.write( "
Algebra.Com's Answer #584232 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
Goal is to fill \"3%2F4\" of pool. The time is unknown.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "RATES
\n" ); document.write( "Inlet, \"1%2F18\"
\n" ); document.write( "Drain, \"-1%2F20\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "RT=V, rate time volume, where V will be how many pools.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%281%2F18-1%2F20%29t=3%2F4\"
\n" ); document.write( "Solve for t.
\n" ); document.write( "
\n" );