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#33104 Bangla Language & Literature Pipe and Tank Level 0

Two pipes A & B would be fill a tank in 20 & 30 minutes respectively. Both pipes being oppen, find when A must be turned off so that the tank may be just filled in 15 minutes.

  1. A After 10 minutes
  2. B After 15 minutes
  3. C After 20 minutes
  4. D None
Answer: A - After 10 minutes

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