An empty rectangular container has a capacity of 48 ℓ and a height of 128 cm. At 9 a.m., Tap N is turned on to fill the container at a rate of 10 ℓ per minute for 20 minutes. After 3 minutes, Tap P is turned on to drain water from the container at a rate of 4 ℓ per minute for 24 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 
48 ℓ = 48000 cm³

Volume of water flowed in from Tap N
= 20 x 10000
= 200000 cm³

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

Volume of water left in the container
= 200000 - 96000
= 104000 cm³

Base area of the container
= 48000 ÷ 128
= 375 cm² 

Height of water left in the container
= 104000 ÷ 375
≈ 277.3 cm

Answer(s): 277.3 cm