A rectangular container measuring 73 cm by 56 cm by 35 cm was to be filled with water by two taps, L and M. Tap L which fills the tank at a rate of 7 ℓ per minute was first turned on for 4 minutes before Tap M was turned on as well. If the tank was filled to the brim in a total of 5 minutes from the time when Tap L was first turned on, what is the rate at which Tap M fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 73 x 56 x 35
= 143080 cm
3 1 ℓ = 1000 cm
3 7 ℓ = 7000 cm
3 Volume of water filled by Tap L
= 7000 x 5
= 35000 cm
3 Volume of water filled by Tap M
= 143080 - 35000
= 108080 cm
3 Rate in which Tap M fills the container
= 108080 ÷ 1
= 108080 cm3/min
108080 mℓ/min
= 108.08 ℓ/min
≈ 108.1 ℓ/min (Correct to 1 decimal place)
Answer(s): 108.1 ℓ/min