A rectangular container measuring 74 cm by 57 cm by 24 cm was to be filled with water by two taps, V and W. Tap V which fills the tank at a rate of 5 ℓ per minute was first turned on for 4 minutes before Tap W was turned on as well. If the tank was filled to the brim in a total of 5 minutes from the time when Tap V was first turned on, what is the rate at which Tap W fills the tank? Give your answer in ℓ per minute correct to 1 decimal place.
Total volume of the container
= 74 x 57 x 24
= 101232 cm
3 1 ℓ = 1000 cm
3 5 ℓ = 5000 cm
3 Volume of water filled by Tap V
= 5000 x 5
= 25000 cm
3 Volume of water filled by Tap W
= 101232 - 25000
= 76232 cm
3 Rate in which Tap W fills the container
= 76232 ÷ 1
= 76232 cm3/min
76232 mℓ/min
= 76.232 ℓ/min
≈ 76.2 ℓ/min (Correct to 1 decimal place)
Answer(s): 76.2 ℓ/min