document.write( "Question 647194: One pipe can fill a tank in 40 minutes while another takes 60 minutes to fill the same tank. How long would it take to fill the tank if both pipes are running? \n" ); document.write( "

Algebra.Com's Answer #406036 by josmiceli(19441) $\"\"$ $\"About$

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Add their rates of filling:
\n" ); document.write( "( 1 tank / 40 min ) + ( 1 tank / 60 min ) = 1 tank / t min
\n" ); document.write( " $\"++1%2F40+%2B+1%2F60+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+120t+\"$
\n" ); document.write( " $\"+3t+%2B+2t+=+120+\"$
\n" ); document.write( " $\"+5t+=+120+\"$
\n" ); document.write( " $\"+t+=+24+\"$
\n" ); document.write( "The tank will be filled in 24 min with both pipes running
\n" ); document.write( " \n" ); document.write( "

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