Question of the Day (26-Oct-14)
Three children Bintu, Cintu and Mintu were standing around a tank. Two of them had a pipe with them which could fill the tank while the third was operating the outlet tap which could empty the tank. Bintu’s pipe could fill the tank alone in 12 hours while Cintu’s pipe could fill the tank alone alone in 15 hours. The outlet tap, manned by Mintu, could empty the tank alone in 20 hours. Initially, Bintu started filling the tank alone. After one hour Cintu joined him. One hour after Cintu started, Mintu also opened the outlet valve. In how many hours will the tank get filled?