Freshers India

Two pipes A and B can fill a cistern in 12 minutes and 16 minutes respectively. If both the pipes are opened together, then after how much time B should be closed so that the tank is full in 9 minutes?                        

Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:                        

A cistern can be filled in 9 hours but it takes 10 hours due to in its bottom. If the cistern is full,then the time that the leak will take to empty it, is: (U.D.C. 1993)                        

Pipe A can fill the tank in 12 minutes and pipe B can empty it in 8 minutes. If 3/4th part of the tank is already full and both the pipes are open together. In much time both the pipes empty the tank?                         

A tank can be filled by a tap in 20 minutes and by another tap in 6O minutes. Both the taps are kept open for 10 minutes and then the first tap is shut off. After this, the tank will be completely filled in:. [Central Excise ]                        

A pipe can fill a tank in 40 minutes. Due to the leakage in the bottom it is filled in 50 hours. If the tank is full, how much time will the leak take to empty it?