document.write( "Question 1183385: Hello\r
\n" ); document.write( "\n" ); document.write( "A pipe can empty a tank in 40 minutes.
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\n" ); document.write( " that of the first is also attached with the tank to empty it.\r
\n" ); document.write( "\n" ); document.write( "The two pipes together can empty the tank in 8
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\n" ); document.write( "\n" ); document.write( "I don't understand how they got 8?\r
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Algebra.Com's Answer #813694 by ikleyn(52787)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "I do not think that in this problem they assume that you are familiar with the basics of hydraulics\r
\n" ); document.write( "\n" ); document.write( "to make a conclusion that the flow rate through the pipe of the doubled diameter is 4 times \r
\n" ); document.write( "\n" ); document.write( "the flow rate through the narrow pipe.\r
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\n" ); document.write( "\n" ); document.write( "Simply, you did not read the problem to the end and posted the problem in the incomplete mode.\r
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\n" ); document.write( "\n" ); document.write( "I am 179% sure that the next phrase in the problem, which you missed to read and to print, is\r
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\n" ); document.write( "\n" ); document.write( "             How fast the second pipe can empty the tank, if it works alone ?\r
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\n" ); document.write( "\n" ); document.write( "The info about flow rate is not intended for you to find out \"why ?\"\r
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\n" ); document.write( "\n" ); document.write( "It is simply the  \"given part\",   after which the question follows.\r
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\n" ); document.write( "\n" ); document.write( "On solving such problems, look the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Using Fractions to solve word problems on joint work \r
\n" ); document.write( "\n" ); document.write( "    - Solving more complicated word problems on joint work \r
\n" ); document.write( "\n" ); document.write( "    - Selected joint-work word problems from the archive \r
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\n" ); document.write( "\n" ); document.write( "Next time, when you post your problems/questions to this forum, \r
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\n" ); document.write( "\n" ); document.write( "print and post them  IN  FULL,  word-in-word,  from the very beginning to the very end,\r
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\n" ); document.write( "\n" ); document.write( "These are the RULES of this forum, \r
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\n" ); document.write( "\n" ); document.write( "About the rules of the forum, see this Internet page\r
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\n" ); document.write( "\n" ); document.write( "from which you post your problems.\r
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\n" ); document.write( "\n" ); document.write( "After observing all arrived answers, I become even more certain, than I was certain before,\r
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