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Q: A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in    ?

  • 1
    20 hrs
  • 2
    28 hrs
  • 3
    36 hrs
  • 4
    40 hrs
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Answer : 1. "20 hrs"
Explanation :

Answer: A) 20 hrs Explanation: 1/8 - 1/x = 1/10  => x = 40 hrs

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