4 identical 5-cm cubes are placed in an empty rectangular container of length 80 cm and width 25 cm. The container is then filled with water from a tap flowing at a rate of 7 litres per minute. It takes 9 minutes to fill up ¹₅ of the container. What is the height of the container? Correct your answer to 1 decimal place.
Volume of 1 cube
= 5 x 5 x 5
= 125 cm³ 

Volume of 4 cubes
= 4 x 125
= 500 cm³ 

1 ℓ = 1000 mℓ
7 ℓ = 7000 mℓ

Volume of water in the container
= 9 x 7000
= 63000 mℓ

Volume of ¹₅ of the container
= 63000 + 500
= 63500 mℓ

Volume of the container
= 63500 ÷ ¹₅
= 63500 x ⁵₁
= 317500 mℓ

Base area
= 80 x 25
= 2000 cm² 

Height of the container
= 317500 ÷ 2000
≈ 158.8 cm

Answer(s): 158.8 cm