A rectangular container measuring 86 cm by 57 cm by 36 cm was to be filled with water by two taps, H and J. Tap H which fills the tank at a rate of 6 ℓ per minute was first turned on for 4 minutes before Tap J was turned on as well. If the tank was filled to the brim in a total of 5 minutes from the time when Tap H was first turned on, what is the rate at which Tap J fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 86 x 57 x 36
= 176472 cm³ 

1 ℓ = 1000 cm³ 
6 ℓ = 6000 cm³ 

Volume of water filled by Tap H
= 6000 x 5
= 30000 cm³

Volume of water filled by Tap J
= 176472 - 30000
= 146472 cm³ 

Rate in which Tap J fills the container
= 146472 ÷ 1
146472 mℓ/min
= 146.472 ℓ/min
≈ 146.5 ℓ/min (Correct to 1 decimal place)

Answer(s): 146.5 ℓ/min