Yoko placed three empty containers side by side. The smallest container has a crack at its side and the base area of each container is 9 cm². After she turned on the tap for 45 minutes, the height of the water in the smallest container became 4 cm although 0.3 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.
Water that leaked from the crack
= 45 x 0.3
= 13.5 mℓ

Water that poured into the 3 containers
= 9 x (4 + 12 + 5 + 33 + 3)
= 9 x 57
= 513 cm³ 
= 513 mℓ

Total water that flowed from the tap
= 513 + 13.5
= 526.5 mℓ

Rate of water flow from the tap
= 526.5 ÷ 45
= 11.7 mℓ/min

Answer(s): 11.7 mℓ/min