document.write( "Question 746597: Can you help please!
\n" ); document.write( "One pipe can fill a tank in 4 hours. A second pipe can fill it in 5 hours. A third pipe can fill it in 6 hours. How long would it take all three pipes to fill the tank working together? \n" ); document.write( "

Algebra.Com's Answer #454389 by josmiceli(19441) $\"\"$ $\"About$

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Add their rates of filling
\n" ); document.write( "1st pipe: ( 1 tank filled ) / ( 4 hrs )
\n" ); document.write( "2nd pipe: ( 1 tank filled ) / ( 5 hrs )
\n" ); document.write( "3rd pipe: ( 1 tank filled ) / ( 6 hrs )
\n" ); document.write( "--------------
\n" ); document.write( " $\"+1%2F4+%2B+1%2F5+%2B+1%2F6+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+60t+\"$
\n" ); document.write( " $\"+15t+%2B+12t+%2B+10t+=+60+\"$
\n" ); document.write( " $\"+37t+=+60+\"$
\n" ); document.write( " $\"+t+=+1.622+\"$ hrs
\n" ); document.write( " $\"+.622%2A60+=+37+\"$
\n" ); document.write( "All 3 pipes working together take 1 hr and 37 min
\n" ); document.write( " \n" ); document.write( "

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