An empty rectangular container has a capacity of 148 ℓ and a height of 50 cm. At 6 a.m., Tap T is turned on to fill the container at a rate of 5 ℓ per minute for 18 minutes. After 12 minutes, Tap U is turned on to drain water from the container at a rate of 7 ℓ per minute for 11 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 
5 ℓ = 5000 cm³ 
7 ℓ = 7000 cm³ 
148 ℓ = 148000 cm³

Volume of water flowed in from Tap T
= 18 x 5000
= 90000 cm³

Volume of water from drained from Tap U
= 11 x 7000
= 77000 cm³

Volume of water left in the container
= 90000 - 77000
= 13000 cm³

Base area of the container
= 148000 ÷ 50
= 2960 cm² 

Height of water left in the container
= 13000 ÷ 2960
≈ 4.4 cm

Answer(s): 4.4 cm