A

Admin • 825.56K Points
Coach

Q. Two pipes fill a tank in 20 hours and 30 hours respectively. If both are opened together, after how many hours will half the tank be filled?

  • (A) 6 hours
  • (B) 7.5 hours
  • (C) 8 hours
  • (D) 10 hours
Explanation by: Admin
Net rate = 1/20 + 1/30 = 1/12 → half tank in 6 hours.

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