document.write( "Question 806035: an inlet pipe on a swimming pool can be used to fill the pool in 10 hours. The drain pipe can be used to empty the pool in 15 hours. If the pool is 1/3 full and then the inlet pipe and drain pipe are both opened, how long from that time will it take to fill the pool?
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Algebra.Com's Answer #485690 by mananth(16946)\"\" \"About 
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an inlet pipe on a swimming pool can be used to fill the pool in 10 hours. The drain pipe can be used to empty the pool in 15 hours. If the pool is 1/3 full and then the inlet pipe and drain pipe are both opened, how long from that time will it take to fill the pool?\r
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\n" ); document.write( "\n" ); document.write( "Inlet pipe does 1/10 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( "drain does 1/15 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( "when both are open they doe 1/10 -1/15 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( "=1/30 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( "1/3 is full so 2/3 is empty\r
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\n" ); document.write( "\n" ); document.write( "(2/3)/(1/30)\r
\n" ); document.write( "\n" ); document.write( "2/3 * 30\r
\n" ); document.write( "\n" ); document.write( "=20 hours\r
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