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Q: Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 3 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill  ?

  • 1
    8.21 min
    Correct
    Incorrect
  • 2
    8 min
    Correct
    Incorrect
  • 3
    8.57 min
    Correct
    Incorrect
  • 4
    8.49 min
    Correct
    Incorrect
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Answer : 3. "8.57 min"
Explanation :

Answer: C) 8.57 min Explanation: 1/10 + 1/15 = 1/6 x 3 = 1/2 1 - 1/2 = 1/2 1/10 + 1/15 - 1/x = 1/2 x = 8.57 min

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