An empty rectangular container has a capacity of 48 ℓ and a height of 15 cm. At 6 a.m., Tap G is turned on to fill the container at a rate of 7 ℓ per minute for 20 minutes. After 4 minutes, Tap H is turned on to drain water from the container at a rate of 6 ℓ per minute for 22 minutes. What is the height of the water level in the container in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
7 ℓ = 7000 cm³ 
6 ℓ = 6000 cm³ 
48 ℓ = 48000 cm³

Volume of water flowed in from Tap G
= 20 x 7000
= 140000 cm³

Volume of water from drained from Tap H
= 22 x 6000
= 132000 cm³

Volume of water left in the container
= 140000 - 132000
= 8000 cm³

Base area of the container
= 48000 ÷ 15
= 3200 cm² 

Height of water left in the container
= 8000 ÷ 3200
≈ 2.5 cm

Answer(s): 2.5 cm