A rectangular container measuring 72 cm by 60 cm by 29 cm was to be filled with water by two taps, A and B. Tap A which fills the tank at a rate of 6 ℓ per minute was first turned on for 3 minutes before Tap B was turned on as well. If the tank was filled to the brim in a total of 5 minutes from the time when Tap A was first turned on, what is the rate at which Tap B fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 72 x 60 x 29
= 125280 cm
3 1 ℓ = 1000 cm
3 6 ℓ = 6000 cm
3 Volume of water filled by Tap A
= 6000 x 5
= 30000 cm
3 Volume of water filled by Tap B
= 125280 - 30000
= 95280 cm
3 Rate in which Tap B fills the container
= 95280 ÷ 2
= 47640 cm3/min
47640 mℓ/min
= 47.64 ℓ/min
≈ 47.6 ℓ/min (Correct to 1 decimal place)
Answer(s): 47.6 ℓ/min