An empty rectangular container has a capacity of 167 ℓ and a height of 20 cm. At 10 a.m., Tap L is turned on to fill the container at a rate of 6 ℓ per minute for 16 minutes. After 9 minutes, Tap M is turned on to drain water from the container at a rate of 3 ℓ per minute for 30 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 
6 ℓ = 6000 cm³ 
3 ℓ = 3000 cm³ 
167 ℓ = 167000 cm³

Volume of water flowed in from Tap L
= 16 x 6000
= 96000 cm³

Volume of water from drained from Tap M
= 30 x 3000
= 90000 cm³

Volume of water left in the container
= 96000 - 90000
= 6000 cm³

Base area of the container
= 167000 ÷ 20
= 8350 cm² 

Height of water left in the container
= 6000 ÷ 8350
≈ 0.7 cm

Answer(s): 0.7 cm