A rectangular container measuring 80 cm by 59 cm by 22 cm was to be filled with water by two taps, H and J. Tap H which fills the tank at a rate of 9 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
= 80 x 59 x 22
= 103840 cm
3 1 ℓ = 1000 cm
3 9 ℓ = 9000 cm
3 Volume of water filled by Tap H
= 9000 x 5
= 45000 cm
3 Volume of water filled by Tap J
= 103840 - 45000
= 58840 cm
3 Rate in which Tap J fills the container
= 58840 ÷ 1
= 58840 cm3/min
58840 mℓ/min
= 58.84 ℓ/min
≈ 58.8 ℓ/min (Correct to 1 decimal place)
Answer(s): 58.8 ℓ/min