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Pipe A fills water twice as fast as pipe B. Together they fill a tank in 12 minutes. How long will B take alone?

Competition practicePipes & Cisterns
  • A24 min
  • B48 min
  • C36 min
  • D18 min

Step-by-Step Solution

If B fills 1 unit/min, A fills 2, together 3. Tank = units, so B alone takes 36 min (A alone 18 min).
Answer: C) 36 min

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