A

Admin • 828.70K Points
Coach

Q. Pipe A can fill a tank in 20 hours and pipe B can empty it in 40 hours. If both are opened together, how long will it take to fill half the tank?

  • (A) 10 hours
  • (B) 20 hours
  • (C) 30 hours
  • (D) 40 hours
Explanation by: Admin
Net rate = 1/20 − 1/40 = 1/40 → half tank in 20 hours.

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