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#30626 Bangla Language & Literature Pipe and Tank Level 0

Two pipe A & B can fill a tank in 15 minutes and 20 minutes respectively. If both pipes are opend together, then after how much time B should be closed so that the tank is full in 10 minutes?

  1. A 20/3
  2. B 4
  3. C 6
  4. D 8
Answer: A - 20/3

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