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To fill an empty cistern, we can use pipe A which would take 20 minutes, or we can use pipe B which would take 15 minutes, or we can use pipe C which would take 12 minutes.

If we turned on all three pipes, how long will it take to fill up the empty cistern?

 Oct 15, 2020
 #1
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1/20  + 1/15  + 1/12  = 1/x     solve for 'x'   the time requird for all 3

 
 Oct 15, 2020

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