document.write( "Question 615249: Two oil pipelines can fill a tank in 30 minutes.Using one of the pipelines would require 45 minutes to fill the tank. How long would it take the second pipeline working alone to fill the tank? \n" ); document.write( "

Algebra.Com's Answer #387028 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+t+\"$ = the time in minutes for the 2nd pipeline
\n" ); document.write( "to fill the tank
\n" ); document.write( "Add their rates of filling to get their rate working together
\n" ); document.write( " $\"+1%2F45+%2B+1%2Ft+=+1%2F30+\"$
\n" ); document.write( "Multiply both sides by $\"+90t+\"$
\n" ); document.write( " $\"+2t+%2B+90+=+3t+\"$
\n" ); document.write( " $\"+t+=+90+\"$
\n" ); document.write( "The 2nd pipeline takes 90 minutes to fill the tank \n" ); document.write( "

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