An empty rectangular container has a capacity of 158 ℓ and a height of 20 cm. At 10 a.m., Tap U is turned on to fill the container at a rate of 8 ℓ per minute for 16 minutes. After 13 minutes, Tap V is turned on to drain water from the container at a rate of 2 ℓ per minute for 19 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 
2 ℓ = 2000 cm³ 
158 ℓ = 158000 cm³

Volume of water flowed in from Tap U
= 16 x 8000
= 128000 cm³

Volume of water from drained from Tap V
= 19 x 2000
= 38000 cm³

Volume of water left in the container
= 128000 - 38000
= 90000 cm³

Base area of the container
= 158000 ÷ 20
= 7900 cm² 

Height of water left in the container
= 90000 ÷ 7900
≈ 11.4 cm

Answer(s): 11.4 cm