A

Admin • 825.56K Points
Coach

Q. A pipe fills a tank in 20 hours. Another pipe empties it in 30 hours. If both are opened together, in how many hours will the tank be filled?

  • (A) 40 hours
  • (B) 50 hours
  • (C) 60 hours
  • (D) 120 hours
Explanation by: Admin
Net rate = 1/20 − 1/30 = 1/60.

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