5. To fill a cistem, pipes A, B and take 20 minutes,
15 minutes and 12 minutes, respectively. The
time in minutes that the three pipes together will
take to fill the cistern is:
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To fill a cistem, pipes A, B and take 20 minutes,
15 minutes and 12 minutes, respectively. The
time in minutes that the three pipes together will
take to fill the cistern is 71 minutes wiil be taking for it
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