document.write( "Question 910530: An inlet pipe can fill a tank in 6 minutes. A drain can empty the tank in 9 minutes. If the tank is empty, and both the pipe and drain are open, how long will it take before the tank overflows? \n" ); document.write( "

Algebra.Com's Answer #552532 by richwmiller(17219) $\"\"$ $\"About$

You can put this solution on YOUR website!
1/a+1/b=1/x
\n" ); document.write( "1/6+1/-9=1/x
\n" ); document.write( "-9/-54+6/-54=1/x
\n" ); document.write( "-3/-54=1/x
\n" ); document.write( "x=-54/-3
\n" ); document.write( "x=18 minutes working together
\n" ); document.write( "check
\n" ); document.write( "x/a+x/b=1
\n" ); document.write( "x/6+x/-9=1
\n" ); document.write( "18/6+18/-9=1
\n" ); document.write( "3+-2=1
\n" ); document.write( "1=1
\n" ); document.write( "ok
\n" ); document.write( " \n" ); document.write( "

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