9 identical 9-cm cubes are placed in an empty rectangular tank of length 73 cm and width 30 cm. The tank is then filled with water from a tap flowing at a rate of 8 litres per minute. It takes 14 minutes to fill up ¹₂ of the tank. What is the height of the tank? Correct your answer to 1 decimal place.
Volume of 1 cube
= 9 x 9 x 9
= 729 cm³ 

Volume of 9 cubes
= 9 x 729
= 6561 cm³ 

1 ℓ = 1000 mℓ
8 ℓ = 8000 mℓ

Volume of water in the tank
= 14 x 8000
= 112000 mℓ

Volume of ¹₂ of the tank
= 112000 + 6561
= 118561 mℓ

Volume of the tank
= 118561 ÷ ¹₂
= 118561 x ²₁
= 237122 mℓ

Base area
= 73 x 30
= 2190 cm² 

Height of the tank
= 237122 ÷ 2190
≈ 108.3 cm

Answer(s): 108.3 cm