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The time pipe A takes to fill a tank is two-thirds of the time pipe B takes. Together they fill it in 18 minutes. How long does A take alone?

Competition practicePipes & Cisterns
  • A45 min
  • B27 min
  • C36 min
  • D30 min

Step-by-Step Solution

Times 2 : 3, so rates 3 : 2. Tank units. A: min; B: 45 min.
Answer: D) 30 min

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