5 identical 8-cm cubes are placed in an empty rectangular tank of length 87 cm and width 30 cm. The tank is then filled with water from a tap flowing at a rate of 6 litres per minute. It takes 10 minutes to fill up ²₅ of the tank. What is the height of the tank? Correct your answer to 1 decimal place.
Volume of 1 cube
= 8 x 8 x 8
= 512 cm³ 

Volume of 5 cubes
= 5 x 512
= 2560 cm³ 

1 ℓ = 1000 mℓ
6 ℓ = 6000 mℓ

Volume of water in the tank
= 10 x 6000
= 60000 mℓ

Volume of ²₅ of the tank
= 60000 + 2560
= 62560 mℓ

Volume of the tank
= 62560 ÷ ²₅
= 62560 x ⁵₂
= 156400 mℓ

Base area
= 87 x 30
= 2610 cm² 

Height of the tank
= 156400 ÷ 2610
≈ 59.9 cm

Answer(s): 59.9 cm