document.write( "Question 636514: Pipe A can fill in 20 minutes and Pipe B in 30 minutes and Pipe C can empty the same in 40 minutes. If all of them work together, find the time taken to fill the tank \n" ); document.write( "
Algebra.Com's Answer #401071 by jerryguo41(197)\"\" \"About 
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1. find the rate in which the cans can be filled by each pipe\r
\n" ); document.write( "\n" ); document.write( "2. write the equation
\n" ); document.write( "Rate of pipe A + Rate of pipe B + Rate of Pipe C = 1 Full Can
\n" ); document.write( "Rate of pipe A: 1/20 per min
\n" ); document.write( "Rate of pipe B: 1/30 per min
\n" ); document.write( "Rate of pipe C: 1/40 per min
\n" ); document.write( "\"x%2F20%2Bx%2F30%2Bx%2F40=1\"
\n" ); document.write( "x= number of min\r
\n" ); document.write( "\n" ); document.write( "3. Clear Fractions (*40)
\n" ); document.write( "\"2x%2B%284%2F3%29x%2Bx=40\"
\n" ); document.write( "\"13%2F3x=40\"
\n" ); document.write( "\"x=40%2F%2813%2F3%29\"
\n" ); document.write( "\"x=9.23\"\r
\n" ); document.write( "\n" ); document.write( "4. It will take 9 mins and 14 sec. to fill the empty can with all three pipes.
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