An empty rectangular container has a capacity of 192 ℓ and a height of 150 cm. At 6 a.m., Tap H is turned on to fill the container at a rate of 4 ℓ per minute for 17 minutes. After 7 minutes, Tap J is turned on to drain water from the container at a rate of 6 ℓ per minute for 8 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 
4 ℓ = 4000 cm³ 
6 ℓ = 6000 cm³ 
192 ℓ = 192000 cm³

Volume of water flowed in from Tap H
= 17 x 4000
= 68000 cm³

Volume of water from drained from Tap J
= 8 x 6000
= 48000 cm³

Volume of water left in the container
= 68000 - 48000
= 20000 cm³

Base area of the container
= 192000 ÷ 150
= 1280 cm² 

Height of water left in the container
= 20000 ÷ 1280
≈ 15.6 cm

Answer(s): 15.6 cm