document.write( "Question 670005: A pipe can fill a tank in 10 hours. If a second pipe is opened, the two pipes together can fill the tank in 6 hours. How long would it take the second pipe alone to fill the tank? \n" ); document.write( "

Algebra.Com's Answer #416707 by josmiceli(19441) $\"\"$ $\"About$

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Add their rates of filling to get rate
\n" ); document.write( "with both pipes open
\n" ); document.write( "1st pipe's rate:
\n" ); document.write( "( 1 tank ) / ( 10 hrs )
\n" ); document.write( "2nd pipe's rate:
\n" ); document.write( "( 1 tank ) / ( x hrs )
\n" ); document.write( "Both together:
\n" ); document.write( "( 1 tank ) / ( 6 hrs )
\n" ); document.write( "----------------
\n" ); document.write( " $\"+1%2F10+%2B+1%2Fx+=+1%2F6+\"$
\n" ); document.write( "Multiply both sides by $\"+30x+\"$
\n" ); document.write( " $\"+3x+%2B+30+=+5x+\"$
\n" ); document.write( " $\"+2x+=+30+\"$
\n" ); document.write( " $\"+x+=+15+\"$
\n" ); document.write( "The 2nd pipe alone can fill the tank in 15 hrs\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );