One top can fill a cistern in 2 hours and another can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened ? November 29, 2023 – by admin 0A. 6 HoursB. 8 HoursC. 5 HoursD. 7 HoursIn 6 hours will the tank be full when both the taps are open.