A tank leaks 9 L of water in 3 minutes. The amount of water leaked in 15 minutes is
A leak in the bottom of a container can empty the full tank in 4 hours. An inlet pipe fills water at the rate of 3 liters a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 6 hours. How many litres does the container hold?