A rectangular container measuring 89 cm by 54 cm by 22 cm was to be filled with water by two taps, F and G. Tap F which fills the tank at a rate of 5 ℓ per minute was first turned on for 4 minutes before Tap G was turned on as well. If the tank was filled to the brim in a total of 5 minutes from the time when Tap F was first turned on, what is the rate at which Tap G fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 89 x 54 x 22
= 105732 cm
3 1 ℓ = 1000 cm
3 5 ℓ = 5000 cm
3 Volume of water filled by Tap F
= 5000 x 5
= 25000 cm
3 Volume of water filled by Tap G
= 105732 - 25000
= 80732 cm
3 Rate in which Tap G fills the container
= 80732 ÷ 1
= 80732 cm3/min
80732 mℓ/min
= 80.732 ℓ/min
≈ 80.7 ℓ/min (Correct to 1 decimal place)
Answer(s): 80.7 ℓ/min