A

Admin • 833.24K Points
Coach

Q. A pipe can fill a tank in 9 hours and another can empty it in 18 hours. If both are opened together, the tank will be filled in?

  • (A) 9 hours
  • (B) 12 hours
  • (C) 18 hours
  • (D) 24 hours

Explanation by: Admin

Net rate = 1/9 − 1/18 = 1/18.

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