A rectangular tank measuring 72 cm by 59 cm by 35 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 2 minutes before Tap W was turned on as well. If the tank was filled to the brim in a total of 7 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 tank
= 72 x 59 x 35
= 148680 cm³ 

1 ℓ = 1000 cm³ 
5 ℓ = 5000 cm³ 

Volume of water filled by Tap V
= 5000 x 7
= 35000 cm³

Volume of water filled by Tap W
= 148680 - 35000
= 113680 cm³ 

Rate in which Tap W fills the tank
= 113680 ÷ 5
22736 mℓ/min
= 22.736 ℓ/min
≈ 22.7 ℓ/min (Correct to 1 decimal place)

Answer(s): 22.7 ℓ/min