document.write( "Question 314186: WORD PROBLEM: Two oil pipes deposit oil into a tank. One of the pipes is three times as large as the other. The larger pipe can fill the tank in 2 hours. How long will it take to fill the tank with both pipes?\r
\n" ); document.write( "\n" ); document.write( "I have tried this problem over and over again and usually come up with the answer of 4 which makes no sense because the correct answer should be less than 2. \n" ); document.write( "
Algebra.Com's Answer #224594 by nerdybill(7384)\"\" \"About 
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WORD PROBLEM: Two oil pipes deposit oil into a tank. One of the pipes is three times as large as the other. The larger pipe can fill the tank in 2 hours. How long will it take to fill the tank with both pipes?
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\n" ); document.write( "Rate of larger pipe: 1tank/2hours
\n" ); document.write( "Rate of smaller pipe: (1/3)(1/2) = 1tank/6hours
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\n" ); document.write( "Let x = time it takes both pipes to fill tank
\n" ); document.write( "then
\n" ); document.write( "x(1/2 + 1/6) = 1
\n" ); document.write( "Multiplying both sides by 6:
\n" ); document.write( "x(3 + 1) = 6
\n" ); document.write( "4x = 6
\n" ); document.write( "x = 6/4
\n" ); document.write( "or
\n" ); document.write( "x = 1.5 hours
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