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The rates of three pipes are in the ratio 2 : 3 : 5. Together they fill a tank in 6 hours. How long does the fastest pipe take alone?

Competition practicePipes & Cisterns
  • A30 h
  • B10 h
  • C12 h
  • D20 h

Step-by-Step Solution

Tank units. Fastest: h. (30 h is the slowest pipe; 20 h the middle one.)
Answer: C) 12 h

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