A rectangular container measuring 89 cm by 60 cm by 22 cm was to be filled with water by two taps, G and H. Tap G which fills the tank at a rate of 8 ℓ per minute was first turned on for 3 minutes before Tap H was turned on as well. If the tank was filled to the brim in a total of 7 minutes from the time when Tap G was first turned on, what is the rate at which Tap H fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 89 x 60 x 22
= 117480 cm
3 1 ℓ = 1000 cm
3 8 ℓ = 8000 cm
3 Volume of water filled by Tap G
= 8000 x 7
= 56000 cm
3 Volume of water filled by Tap H
= 117480 - 56000
= 61480 cm
3 Rate in which Tap H fills the container
= 61480 ÷ 4
= 15370 cm3/min
15370 mℓ/min
= 15.37 ℓ/min
≈ 15.4 ℓ/min (Correct to 1 decimal place)
Answer(s): 15.4 ℓ/min