document.write( "Question 387936: An aquarium tank can hold 6000 liters of water. There are two pipes that can be used to fill the tank. The first pipe alone can fill the tank in 50 minutes. The second pipe can fill the tank in 75 minutes by itself. When both pipes are working together, how long does it take them to fill the tank? \n" ); document.write( "
Algebra.Com's Answer #274243 by Alan3354(69443)\"\" \"About 
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The 1st pipe fills 1/50 of the tank per minute.
\n" ); document.write( "The 2nd pipe fills 1/75 of the tank per minute.
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