A rectangular container measuring 83 cm by 52 cm by 25 cm was to be filled with water by two taps, G and H. Tap G which fills the tank at a rate of 6 ℓ per minute was first turned on for 2 minutes before Tap H was turned on as well. If the tank was filled to the brim in a total of 7 minutes from the time when Tap G was first turned on, what is the rate at which Tap H fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 83 x 52 x 25
= 107900 cm³ 

1 ℓ = 1000 cm³ 
6 ℓ = 6000 cm³ 

Volume of water filled by Tap G
= 6000 x 7
= 42000 cm³

Volume of water filled by Tap H
= 107900 - 42000
= 65900 cm³ 

Rate in which Tap H fills the container
= 65900 ÷ 5
13180 mℓ/min
= 13.18 ℓ/min
≈ 13.2 ℓ/min (Correct to 1 decimal place)

Answer(s): 13.2 ℓ/min