An empty rectangular container has a capacity of 42 ℓ and a height of 75 cm. At 9 a.m., Tap U is turned on to fill the container at a rate of 7 ℓ per minute for 15 minutes. After 13 minutes, Tap V is turned on to drain water from the container at a rate of 7 ℓ per minute for 12 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 
7 ℓ = 7000 cm³ 
42 ℓ = 42000 cm³

Volume of water flowed in from Tap U
= 15 x 7000
= 105000 cm³

Volume of water from drained from Tap V
= 12 x 7000
= 84000 cm³

Volume of water left in the container
= 105000 - 84000
= 21000 cm³

Base area of the container
= 42000 ÷ 75
= 560 cm² 

Height of water left in the container
= 21000 ÷ 560
≈ 37.5 cm

Answer(s): 37.5 cm