A group of fire brigade personnel carried a right-circular cylindrical tank filled with water and pumped out water at a speed of 420 meters per minute to put out the fire in 40 minutes by three hose pipes of 2 cm diameter each. If the diameter of the tank is 2⋅8 meters and its length is 6 meters, then calculate (i) how much water (in liters) has been spent in putting out the fire and (ii) how much water (in liters) that still remains in the tank.