A rectangular container measuring 71 cm by 51 cm by 36 cm was to be filled with water by two taps, W and X. Tap W which fills the tank at a rate of 6 ℓ per minute was first turned on for 4 minutes before Tap X was turned on as well. If the tank was filled to the brim in a total of 6 minutes from the time when Tap W was first turned on, what is the rate at which Tap X fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 71 x 51 x 36
= 130356 cm³ 

1 ℓ = 1000 cm³ 
6 ℓ = 6000 cm³ 

Volume of water filled by Tap W
= 6000 x 6
= 36000 cm³

Volume of water filled by Tap X
= 130356 - 36000
= 94356 cm³ 

Rate in which Tap X fills the container
= 94356 ÷ 2
47178 mℓ/min
= 47.178 ℓ/min
≈ 47.2 ℓ/min (Correct to 1 decimal place)

Answer(s): 47.2 ℓ/min