5. To fill a cistern, pipes A, B and C 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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Answer:
pipes A, B, C fill the cistern in 1 minute= 1/20+1/15+1/12=2/10=1/5
pipes A, B, C will take 5 minutes to complete fill the cistern.
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