document.write( "Question 505955: If a tank takes 20,30, and 60 minutes by three pipes to fill up seperately, how many minutes will it take to fill up with all three pipes together? \n" ); document.write( "

Algebra.Com's Answer #340027 by josmiceli(19441) $\"\"$ $\"About$

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Add the rate of filling
\n" ); document.write( "( 1 tank / 20 min ) + ( 1 tank / 30 min ) + ( 1 tank / 60 min ) = ( 1 tank / x min )
\n" ); document.write( " $\"+1%2F20+%2B+1%2F30+%2B+1%2F60+=+1%2Fx+\"$
\n" ); document.write( "Multiply both sides by $\"+60x+\"$
\n" ); document.write( " $\"+3x+%2B+2x+%2B+x+=+60+\"$
\n" ); document.write( " $\"+6x+=+60+\"$
\n" ); document.write( " $\"+x+=+10+\"$
\n" ); document.write( "It will take 10 min to fill tank with all 3 pipes \n" ); document.write( "

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