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 #845289 by ikleyn(52795)\"\" \"About 
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\n" ); document.write( "In a laundry sink, the hot water tap lets out 3 litres of water every minute.
\n" ); document.write( "The cold water tap lets out 4 litres of water every minute.
\n" ); document.write( "If the sink is left unplugged, 2 litres of water are drained every minute.
\n" ); document.write( "With the sink unplugged, I turn on the cold water tap.
\n" ); document.write( "Three minutes later, I turn on the hot water tap as well.
\n" ); document.write( "I leave both taps running for another 2 minutes before both taps are turned off.
\n" ); document.write( "How long do I now have to wait before the sink is completely drained?
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\n" ); document.write( "\n" ); document.write( "        Many words,  but the idea of solution is simple - \r
\n" ); document.write( "\n" ); document.write( "        accurately count the balance of water.\r
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document.write( "During first three minutes, the inflow is 4*3 liters = 12 liters (the cold water tap);\r\n" );
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document.write( "                            the outflow is 2*3 liters = 6 liters (the sink);\r\n" );
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document.write( "                            the net inflow is 12 - 6 = 6 liters.\r\n" );
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document.write( "During next two minutes, the inflow is 4*2 + 3*2 = 14 liters (both the cold water tap and hot water tap;);\r\n" );
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document.write( "                         the outflow is 2*2 = 4 liters (the sink);\r\n" );
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document.write( "                         the net inflow is 14 - 4 = 10 liters.\r\n" );
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document.write( "After 3+2 = 5 minutes both taps are turned off.\r\n" );
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document.write( "Now only the sink is on. It drains 6+10 = 16 liters at the rate of 2 liters per minute.\r\n" );
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document.write( "So, you need wait 16/2 = 8 minutes to get the sink completely drained.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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\n" ); document.write( "\n" ); document.write( "Just boldly go forward and count everything in your path.\r
\n" ); document.write( "\n" ); document.write( "There is no need for bright ideas.\r
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\n" ); document.write( "\n" ); document.write( "You only need to know right words and use them properly in order for seem smart.\r
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