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Pipe A fills a tank with plain water in 6 hours and pipe B fills it with juice concentrate in 9 hours. Both are opened on the empty tank; A is closed after 2 hours and B fills the rest. What fraction of the full tank is concentrate?

Competition practicePipes & Cisterns
  • A
  • B
  • C
  • D

Step-by-Step Solution

In 2 h: water , concentrate . B then fills . Concentrate assumes both run to the end.)
Answer: C)

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