A rectangular container measuring 79 cm by 56 cm by 35 cm was to be filled with water by two taps, K and L. Tap K which fills the tank at a rate of 6 ℓ per minute was first turned on for 3 minutes before Tap L was turned on as well. If the tank was filled to the brim in a total of 5 minutes from the time when Tap K was first turned on, what is the rate at which Tap L fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 79 x 56 x 35
= 154840 cm
3 1 ℓ = 1000 cm
3 6 ℓ = 6000 cm
3 Volume of water filled by Tap K
= 6000 x 5
= 30000 cm
3 Volume of water filled by Tap L
= 154840 - 30000
= 124840 cm
3 Rate in which Tap L fills the container
= 124840 ÷ 2
= 62420 cm3/min
62420 mℓ/min
= 62.42 ℓ/min
≈ 62.4 ℓ/min (Correct to 1 decimal place)
Answer(s): 62.4 ℓ/min