An empty rectangular container has a capacity of 192 ℓ and a height of 120 cm. At 10 a.m., Tap Y is turned on to fill the container at a rate of 9 ℓ per minute for 19 minutes. After 8 minutes, Tap Z is turned on to drain water from the container at a rate of 8 ℓ per minute for 21 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 
9 ℓ = 9000 cm³ 
8 ℓ = 8000 cm³ 
192 ℓ = 192000 cm³

Volume of water flowed in from Tap Y
= 19 x 9000
= 171000 cm³

Volume of water from drained from Tap Z
= 21 x 8000
= 168000 cm³

Volume of water left in the container
= 171000 - 168000
= 3000 cm³

Base area of the container
= 192000 ÷ 120
= 1600 cm² 

Height of water left in the container
= 3000 ÷ 1600
≈ 1.9 cm

Answer(s): 1.9 cm