A rectangular container measuring 70 cm by 50 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 4 minutes before Tap H was turned on as well. If the tank was filled to the brim in a total of 6 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
= 70 x 50 x 22
= 77000 cm
3 1 ℓ = 1000 cm
3 8 ℓ = 8000 cm
3 Volume of water filled by Tap G
= 8000 x 6
= 48000 cm
3 Volume of water filled by Tap H
= 77000 - 48000
= 29000 cm
3 Rate in which Tap H fills the container
= 29000 ÷ 2
= 14500 cm3/min
14500 mℓ/min
= 14.5 ℓ/min
≈ 14.5 ℓ/min (Correct to 1 decimal place)
Answer(s): 14.5 ℓ/min