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A drain removes one-eighth of the water in a full tank every 30 minutes. How long does the full tank take to empty?

Competition practicePipes & Cisterns
  • A8 h
  • B16 h
  • C2 h
  • D4 h

Step-by-Step Solution

Eight half-hours are needed: min h. (8 h treats each step as an hour.)
Answer: D) 4 h

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