An empty rectangular container has a capacity of 121 ℓ and a height of 200 cm. At 6 a.m., Tap V is turned on to fill the container at a rate of 7 ℓ per minute for 17 minutes. After 6 minutes, Tap W is turned on to drain water from the container at a rate of 9 ℓ per minute for 6 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 
7 ℓ = 7000 cm³ 
9 ℓ = 9000 cm³ 
121 ℓ = 121000 cm³

Volume of water flowed in from Tap V
= 17 x 7000
= 119000 cm³

Volume of water from drained from Tap W
= 6 x 9000
= 54000 cm³

Volume of water left in the container
= 119000 - 54000
= 65000 cm³

Base area of the container
= 121000 ÷ 200
= 605 cm² 

Height of water left in the container
= 65000 ÷ 605
≈ 107.4 cm

Answer(s): 107.4 cm