Two pipes, A and B, can fill a tank in 10 minutes and 20 minutes, respectively. The pipe C can empty the tank in 30 minutes. All the three pipes are o...
Question
Two pipes, A and B, can fill a tank in 10 minutes and 20 minutes, respectively. The pipe C can empty the tank in 30 minutes. All the three pipes are opened at the same time in the beginning. However, pipe C is closed 2 minutes before the tank is filled. In what time will the tank be full (in minutes)?