document.write( "Question 757695: one pipe can fill empty pool in 12 hours, and another in 18 hours. Suppose both pipes are opened at 8 am and swimming scheduled at 2 pm that day. will the pool be filled by then? \n" ); document.write( "

Algebra.Com's Answer #461016 by josmiceli(19441) $\"\"$ $\"About$

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rate of filling:
\n" ); document.write( "( 1 pool ) / ( 12 hrs ) + ( 1 pool ) / ( 18 hrs )
\n" ); document.write( "Let $\"+t+\"$ = time in hrs to fill pool with both pipes open
\n" ); document.write( " $\"+1%2F12+%2B+1%2F18+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+36t+\"$
\n" ); document.write( " $\"+3t+%2B+2t+=+36+\"$
\n" ); document.write( " $\"+5t+=+36+\"$
\n" ); document.write( " $\"+t+=+7.2+\"$ hrs
\n" ); document.write( "From 8 AM to 2 PM is 6 hrs
\n" ); document.write( "The pool will not be filled in time
\n" ); document.write( " \n" ); document.write( "

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