An empty rectangular container has a capacity of 186 ℓ and a height of 120 cm. At 8 a.m., Tap S is turned on to fill the container at a rate of 9 ℓ per minute for 15 minutes. After 15 minutes, Tap T is turned on to drain water from the container at a rate of 4 ℓ per minute for 15 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 
4 ℓ = 4000 cm³ 
186 ℓ = 186000 cm³

Volume of water flowed in from Tap S
= 15 x 9000
= 135000 cm³

Volume of water from drained from Tap T
= 15 x 4000
= 60000 cm³

Volume of water left in the container
= 135000 - 60000
= 75000 cm³

Base area of the container
= 186000 ÷ 120
= 1550 cm² 

Height of water left in the container
= 75000 ÷ 1550
≈ 48.4 cm

Answer(s): 48.4 cm