An empty rectangular container has a capacity of 63 ℓ and a height of 10 cm. At 6 a.m., Tap F is turned on to fill the container at a rate of 4 ℓ per minute for 15 minutes. After 9 minutes, Tap G is turned on to drain water from the container at a rate of 4 ℓ per minute for 13 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 
4 ℓ = 4000 cm³ 
63 ℓ = 63000 cm³

Volume of water flowed in from Tap F
= 15 x 4000
= 60000 cm³

Volume of water from drained from Tap G
= 13 x 4000
= 52000 cm³

Volume of water left in the container
= 60000 - 52000
= 8000 cm³

Base area of the container
= 63000 ÷ 10
= 6300 cm² 

Height of water left in the container
= 8000 ÷ 6300
≈ 1.3 cm

Answer(s): 1.3 cm