document.write( "Question 353826: One can fill a tank in 4 hours. Together with a second pipe, the tank can be filled in 3 hours. How long would it take the second pipe alone to fill the tank? \n" ); document.write( "

Algebra.Com's Answer #252942 by nerdybill(7384) $\"\"$ $\"About$

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One can fill a tank in 4 hours. Together with a second pipe, the tank can be filled in 3 hours. How long would it take the second pipe alone to fill the tank?
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\n" ); document.write( "Let x = time (hours) for second pipe to fill alone
\n" ); document.write( "then
\n" ); document.write( "3(1/4 + 1/x) = 1
\n" ); document.write( "multiplying both sides by 4x:
\n" ); document.write( "3(x + 4) = 4x
\n" ); document.write( "3x + 12 = 4x
\n" ); document.write( "12 hours = x \n" ); document.write( "

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