document.write( "Question 438592: It takes one pipe 10 min to fill a certain tank with water. It takes a second pipe 15 min. With both pipes open and the tank empty how long would it take to fill the tank? \n" ); document.write( "
Algebra.Com's Answer #303239 by Alan3354(69443)\"\" \"About 
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1 pipe fills 1/10 of the tank per minute.
\n" ); document.write( "The other fills 1/15 per minute.
\n" ); document.write( "Together they fill 1/10 + 1/15 per minute.
\n" ); document.write( "Can you take it from there?
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