A rectangular container measuring 90 cm by 50 cm by 33 cm was to be filled with water by two taps, W and X. Tap W which fills the tank at a rate of 8 ℓ per minute was first turned on for 3 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
= 90 x 50 x 33
= 148500 cm
3 1 ℓ = 1000 cm
3 8 ℓ = 8000 cm
3 Volume of water filled by Tap W
= 8000 x 6
= 48000 cm
3 Volume of water filled by Tap X
= 148500 - 48000
= 100500 cm
3 Rate in which Tap X fills the container
= 100500 ÷ 3
= 33500 cm3/min
33500 mℓ/min
= 33.5 ℓ/min
≈ 33.5 ℓ/min (Correct to 1 decimal place)
Answer(s): 33.5 ℓ/min