document.write( "Question 1207433: In a laundry sink, the hot water tap lets out 3 litres of water every minute. The cold water tap lets out 4 litres of water every minute. If the sink is left unplugged, 2 litres of water are drained every minute. With the sink unplugged, I turn on the cold water tap. Three minutes later, I turn on the hot water tap as well. I leave both taps running for another 2 minutes before both taps are turned off. How long do I now have to wait before the sink is completely drained? \n" ); document.write( "

Algebra.Com's Answer #845290 by greenestamps(13200) $\"\"$ $\"About$

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\n" ); document.write( "The cold water tap, filling the sink at the rate of 4 liters per minute, is on for 3+2=5 minutes, putting 4*5=20 liters of water in the sink.

\n" ); document.write( "The hot water tap, filling the sink at the rate of 3 liters per minute, is on for 2 minutes, putting 3*2=6 liters of water in the sink.

\n" ); document.write( "So a total of 20+6=26 liters of water was put into the tank.

\n" ); document.write( "The drain empties the tank at the rate of 2 liters per minutes; the amount of time it takes to drain 26 liters is 26/2 = 13 minutes.

\n" ); document.write( "The drain is open for the 5 minutes while the taps are putting water into the sink; the number of minutes it takes to empty the sink after the taps are turned off is 13-5=8.

\n" ); document.write( "ANSWER: 8 minutes

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