An empty rectangular container has a capacity of 186 ℓ and a height of 31 cm. At 10 a.m., Tap Z is turned on to fill the container at a rate of 8 ℓ per minute for 15 minutes. After 2 minutes, Tap A is turned on to drain water from the container at a rate of 7 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 
8 ℓ = 8000 cm³ 
7 ℓ = 7000 cm³ 
186 ℓ = 186000 cm³

Volume of water flowed in from Tap Z
= 15 x 8000
= 120000 cm³

Volume of water from drained from Tap A
= 15 x 7000
= 105000 cm³

Volume of water left in the container
= 120000 - 105000
= 15000 cm³

Base area of the container
= 186000 ÷ 31
= 6000 cm² 

Height of water left in the container
= 15000 ÷ 6000
≈ 2.5 cm

Answer(s): 2.5 cm