document.write( "Question 418676: one pipe fills a tank in 8 minutes, another pipe can fill it in 12 minutes. find the time taken to fill the tank when both pipes are running together? \n" ); document.write( "
Algebra.Com's Answer #292946 by Alan3354(69443)\"\" \"About 
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One pipe fills 1/8 of the tank per minute.
\n" ); document.write( "The other fills 1/12 of the tank per minute.
\n" ); document.write( "Together, they fill 1/8 + 1/12 per minute = 3/24 + 2/24 = 5/24
\n" ); document.write( "5/24 tank per minute --> 24/5 minutes per tank
\n" ); document.write( "= 4.8 minutes
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\n" ); document.write( "Use the shortcut, product/sum
\n" ); document.write( "8*12/(8+12) = 96/20
\n" ); document.write( "= 4.8 minutes
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