Gabby placed three empty containers side by side. The smallest container has a crack at its side and the base area of each container is 16 cm². After she turned on the tap for 60 minutes, the height of the water in the smallest container became 6 cm although 0.5 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
= 60 x 0.5
= 30 mℓ

Water that poured into the 3 containers
= 16 x (6 + 20 + 7 + 35 + 7)
= 16 x 75
= 1200 cm³ 
= 1200 mℓ

Total water that flowed from the tap
= 1200 + 30
= 1230 mℓ

Rate of water flow from the tap
= 1230 ÷ 60
= 20.5 mℓ/min

Answer(s): 20.5 mℓ/min