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  9. Q115

RRB NTPC 2025 · Question 115 of 409

Two pipes can fill a cistern, individually, in 99 min and 90 min, respectively. There is a pipe located at the bottom of the cistern to empty it. If all the three pipes are opened simultaneously, then the empty cistern gets filled in 50 min. How long will the pipe at the bottom of the tank take to empty the completely filled cistern if no other pipe is then open?

  1. A841 min
  2. B825 minCorrect
  3. C822 min
  4. D815 min

Answer: B. 825 min

Official answer key verified. Detailed explanation coming soon.

Source: RRB NTPC Under-Graduate CBT-2 response sheet 20-Dec-2025 (candidate-shared copy of official answer-key viewing) · official-answer-key

← Q114View full paper (409 questions)Q116 →

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