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Using the two inlet pipes in the figure together, how long will the empty tank take to fill?

Competition practicePipes & Cisterns
  • A6 h
  • B12.5 h
  • C25 h
  • D5 h

Step-by-Step Solution

Per hour: . Time = 6 h. (12.5 h is the average of the two times, which is wrong.)
Answer: A) 6 h

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