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#14047 Bangla Language & Literature চৌবাচ্চা Level 0

A pipe fills a tank in P minutes and another pipe fills the tank in q minutes, A different pipe makes the tank empty in r minutes. If all these tree pipe are opened then in how many minutes the tank will be full ?

  1. A (p + p - q) / pqr
  2. B (pq + pr - pq) pqr
  3. C (pq + qr - pr) / pqr
  4. D None
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