document.write( "Question 1115563: An inlet pipe can fill a tank in 15 minutes. A drain can empty the tank in 20 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 #730395 by juno(1) $\"\"$ $\"About$

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1/15-1/20=1/x
\n" ); document.write( "5/300=1/x
\n" ); document.write( "hence x=6
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