document.write( "Question 803384: pump a can fill an empty tank in 30 hours ,pump b can empty a filled tank in 36 hours.if both the pumps opperate simultaniously the tank can be filled in how many hours \n" ); document.write( "
Algebra.Com's Answer #484334 by mananth(16946)\"\" \"About 
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Filling or emptying the pool we consider as 1 job\r
\n" ); document.write( "\n" ); document.write( "Pump A takes 30 hours to do 1 job
\n" ); document.write( "so it does 1/30 of the jb in 1 hour\r
\n" ); document.write( "\n" ); document.write( "Similarly pump B does 1/36 of the job in 1 hour\r
\n" ); document.write( "\n" ); document.write( "Actual jbo done\r
\n" ); document.write( "\n" ); document.write( "1/30 -/36 LCD = 180\r
\n" ); document.write( "\n" ); document.write( "(6-5)/180 \r
\n" ); document.write( "\n" ); document.write( "=1/180 of the job is done in 1 hour\r
\n" ); document.write( "\n" ); document.write( "so it will take 180 hours to complete the job that is filling the pool
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