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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?

 Jun 29, 2020
 #1
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1/20 + 1/15 + 1/12  = 1/x     solve for x the amount of time required if all three are used

 

3/60 + 4/60 + 5/60 = 1/x

12/60 = 1/x

x = 60/12 = 5 minutes

 Jun 29, 2020

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