A

Admin • 828.03K Points
Coach

Q. Pipe A fills a tank in 15 hours and pipe B empties it in 20 hours. Pipe C fills it in 30 hours. If all are opened together, how long will it take to fill the tank?

  • (A) 30 hours
  • (B) 60 hours
  • (C) No filling
  • (D) 20 hours
Explanation by: Admin
Net rate = 1/15 + 1/30 − 1/20 = 1/60.

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