A

Admin • 825.56K Points
Coach

Q. Pipe A can fill a tank in 30 hours. Pipe B can fill it in 60 hours. Pipe C empties it in 20 hours. If all are opened together, the tank will be filled in?

  • (A) 30 hours
  • (B) 60 hours
  • (C) No filling
  • (D) 120 hours
Explanation by: Admin
Net rate = 1/30 + 1/60 − 1/20 = 0.

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