Shanna placed three empty tanks side by side as shown below. The smallest tank has a crack at the bottom of its side and the base area of each tank is 16 cm3. After she turned on the tap for 64 minutes, the height of the water in the smallest tank became 6 cm although 0.7 ml of water is leaking out of the crack per minute. Find the rate of flow of water from the tap. Give your answer in ml/min.