An empty rectangular tank has a capacity of 182 ℓ and a height of 200 cm. At 8 a.m., Tap Q is turned on to fill the tank at a rate of 6 ℓ per minute for 19 minutes. After 2 minutes, Tap R is turned on to drain water from the tank at a rate of 2 ℓ per minute for 30 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 
6 ℓ = 6000 cm³ 
2 ℓ = 2000 cm³ 
182 ℓ = 182000 cm³

Volume of water flowed in from Tap Q
= 19 x 6000
= 114000 cm³

Volume of water from drained from Tap R
= 30 x 2000
= 60000 cm³

Volume of water left in the tank
= 114000 - 60000
= 54000 cm³

Base area of the tank
= 182000 ÷ 200
= 910 cm² 

Height of water left in the tank
= 54000 ÷ 910
≈ 59.3 cm

Answer(s): 59.3 cm