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A pipe can fill a tank in 15 hours. Because of a leak, it fills only of the tank in 12 hours. How long would the leak alone take to empty the full tank?

Competition practicePipes & Cisterns
  • A30 h
  • B60 h
  • C20 h
  • D45 h

Step-by-Step Solution

Net rate . Leak → 60 h. (20 h is the net filling time.)
Answer: B) 60 h

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