An empty rectangular container has a capacity of 198 ℓ and a height of 12 cm. At 6 a.m., Tap G is turned on to fill the container at a rate of 5 ℓ per minute for 17 minutes. After 4 minutes, Tap H is turned on to drain water from the container at a rate of 7 ℓ per minute for 5 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 
5 ℓ = 5000 cm³ 
7 ℓ = 7000 cm³ 
198 ℓ = 198000 cm³

Volume of water flowed in from Tap G
= 17 x 5000
= 85000 cm³

Volume of water from drained from Tap H
= 5 x 7000
= 35000 cm³

Volume of water left in the container
= 85000 - 35000
= 50000 cm³

Base area of the container
= 198000 ÷ 12
= 16500 cm² 

Height of water left in the container
= 50000 ÷ 16500
≈ 3 cm

Answer(s): 3 cm