An empty rectangular container has a capacity of 198 ℓ and a height of 50 cm. At 7 a.m., Tap U is turned on to fill the container at a rate of 8 ℓ per minute for 18 minutes. After 2 minutes, Tap V is turned on to drain water from the container at a rate of 4 ℓ per minute for 25 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 
8 ℓ = 8000 cm³ 
4 ℓ = 4000 cm³ 
198 ℓ = 198000 cm³

Volume of water flowed in from Tap U
= 18 x 8000
= 144000 cm³

Volume of water from drained from Tap V
= 25 x 4000
= 100000 cm³

Volume of water left in the container
= 144000 - 100000
= 44000 cm³

Base area of the container
= 198000 ÷ 50
= 3960 cm² 

Height of water left in the container
= 44000 ÷ 3960
≈ 11.1 cm

Answer(s): 11.1 cm