An empty rectangular tank has a capacity of 198 ℓ and a height of 10 cm. At 7 a.m., Tap K is turned on to fill the tank at a rate of 7 ℓ per minute for 19 minutes. After 11 minutes, Tap L is turned on to drain water from the tank at a rate of 4 ℓ per minute for 24 minutes. What is the height of the water level in the tank in the end? Give the answer in 1 decimal place.
1 ℓ = 1000 cm³ 
7 ℓ = 7000 cm³ 
4 ℓ = 4000 cm³ 
198 ℓ = 198000 cm³

Volume of water flowed in from Tap K
= 19 x 7000
= 133000 cm³

Volume of water from drained from Tap L
= 24 x 4000
= 96000 cm³

Volume of water left in the tank
= 133000 - 96000
= 37000 cm³

Base area of the tank
= 198000 ÷ 10
= 19800 cm² 

Height of water left in the tank
= 37000 ÷ 19800
≈ 1.9 cm

Answer(s): 1.9 cm