Marion placed three empty tanks side by side. The smallest tank has a crack at its side and the base area of each tank is 9 cm2. After she turned on the tap for 56 minutes, the height of the water in the smallest tank became 5 cm although 0.9 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.