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Q:

Three pipes A, B can fill the tank in 12, 20 hrs respectively and C can empty the tank in 30 hours. If the pipes are opened alternatively for 1 hour starting with A and drain pipe is kept open all the time. How much time will it take to fill the tank.

  • 1
    12
  • 2
    30
  • 3
    15
  • 4
    20
  • 5
    None of these
  • Show Answer
  • Workspace

Answer : 2. "30"

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