document.write( "Question 1081540: A swimming pool holds 54 cubic meters of water. It can be drained at a rate of one cubic meter minute faster than it can be filled. If it takes 9 minutes longer to fill it than to drain it, find the drainage rate. \n" ); document.write( "

Algebra.Com's Answer #695590 by ikleyn(52864) $\"\"$ $\"About$

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\n" ); document.write( "The drainage rate is 3 m^3 per minute.\r
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\n" ); document.write( "\n" ); document.write( "I solved it mentally.\r
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\n" ); document.write( "\n" ); document.write( "But if you want to see the equations, here they are.\r
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document.write( "Let d = the drainage rate, in m^3/minute.\r\n" );
document.write( "    f = the filing rate.\r\n" );
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document.write( "Then \r\n" );
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document.write( "d - f = 1,\r\n" );
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document.write( " -  = 9.\r\n" );
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document.write( "From the first equation, express f = d-1 and substitute it into the second equation. You will get\r\n" );
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document.write( " -  = 9.\r\n" );
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document.write( "Solve it for d.\r\n" );
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