An empty rectangular container has a capacity of 192 ℓ and a height of 40 cm. At 10 a.m., Tap R is turned on to fill the container at a rate of 10 ℓ per minute for 19 minutes. After 12 minutes, Tap S is turned on to drain water from the container at a rate of 4 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 
10 ℓ = 10000 cm³ 
4 ℓ = 4000 cm³ 
192 ℓ = 192000 cm³

Volume of water flowed in from Tap R
= 19 x 10000
= 190000 cm³

Volume of water from drained from Tap S
= 5 x 4000
= 20000 cm³

Volume of water left in the container
= 190000 - 20000
= 170000 cm³

Base area of the container
= 192000 ÷ 40
= 4800 cm² 

Height of water left in the container
= 170000 ÷ 4800
≈ 35.4 cm

Answer(s): 35.4 cm