document.write( "Question 865723: At a dairy plant, a milk tank can be filled in 4 hours (using the in-valve). Using the out-valve, the tank can be emptied in 12 hours. If both valves are open and milk is being pump into the tank, how long will it take to fill the tank? \n" ); document.write( "

Algebra.Com's Answer #521838 by richwmiller(17219) $\"\"$ $\"About$

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1/4-1/12=1/x
\n" ); document.write( "3/12-1/12=1/x
\n" ); document.write( "2/12=1/c
\n" ); document.write( "1/6=1/c
\n" ); document.write( "c=6 hours to fill the tank
\n" ); document.write( "in 6 hours the tank is filled 1.5 times
\n" ); document.write( "it is half emptied in 6 hours.
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