A rectangular tank measuring 74 cm by 53 cm by 33 cm was to be filled with water by two taps, H and J. Tap H which fills the tank at a rate of 8 ℓ per minute was first turned on for 3 minutes before Tap J was turned on as well. If the tank was filled to the brim in a total of 6 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 tank
= 74 x 53 x 33
= 129426 cm
3 1 ℓ = 1000 cm
3 8 ℓ = 8000 cm
3 Volume of water filled by Tap H
= 8000 x 6
= 48000 cm
3 Volume of water filled by Tap J
= 129426 - 48000
= 81426 cm
3 Rate in which Tap J fills the tank
= 81426 ÷ 3
= 27142 cm3/min
27142 mℓ/min
= 27.142 ℓ/min
≈ 27.1 ℓ/min (Correct to 1 decimal place)
Answer(s): 27.1 ℓ/min