document.write( "Question 871507: Pump A can fill a tank of water in 3 hours. Pump B can fill the same tank in 6 hours. How long does it take the two pumps working together to fill the tank? \n" ); document.write( "
Algebra.Com's Answer #525562 by josgarithmetic(39620)\"\" \"About 
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You use two things:\r
\n" ); document.write( "\n" ); document.write( "The rate of both pumps operating together is the sum of their individual rates, and the rate unit is in tank per hour.\r
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