Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes, C is also opened. The tank is filled up in

Two pipes A and B can fill a tank in 20 and 24 minutes. Resepctively. Pipe C can empty the tank in 10 minutes. Pipes A and B are opened for 5 minutes and then pipe C is also opend. In what time can tank become full or empty after opening pipe C?

Pipes A and B can fill a tank in 18 minutes and 22 1/2 minutes, respectively while pipe C can empty the full tank in 12 minutes. A and B are opened together for 6 minutes and then closed. Now C is opened. C alone will empty the tank in ..........

Two pipes A and B can fill a tank in 25 min and 45 min respectively. Pipe C can empty. The tank in 10 minutes. If pipe A and pipe B are kept open for 5 minutes in The begining and then C is also opened. In what time will the tank be emptied?

Pipes P and Q can fill a tank in 18 and 27 minutes, respectively, whereas pipe R can empty thefull tank in 54 minutes. P and Q were opened together for 6 minutes and then closed and R was opened. The tank was emptied by R alone in:

Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively while a third pipe C can empty the full thank in 20 minutes.All the three pipes are opened in the beginning. However,pipe C is closed 6 minutes before the tank is filled.In what time will the tank be full?

Two pipes A and B can fill a tank in 100 minutes and 120 minutes respectively. Pipe C can alone empty the same tank in 200 minutes. If all three pipes are opened together, then in how many minutes will the tank be filled?