A rectangular container measuring 74 cm by 52 cm by 30 cm was to be filled with water by two taps, V and W. Tap V which fills the tank at a rate of 5 ℓ per minute was first turned on for 2 minutes before Tap W was turned on as well. If the tank was filled to the brim in a total of 6 minutes from the time when Tap V was first turned on, what is the rate at which Tap W fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 74 x 52 x 30
= 115440 cm³ 

1 ℓ = 1000 cm³ 
5 ℓ = 5000 cm³ 

Volume of water filled by Tap V
= 5000 x 6
= 30000 cm³

Volume of water filled by Tap W
= 115440 - 30000
= 85440 cm³ 

Rate in which Tap W fills the container
= 85440 ÷ 4
21360 mℓ/min
= 21.36 ℓ/min
≈ 21.4 ℓ/min (Correct to 1 decimal place)

Answer(s): 21.4 ℓ/min