A rectangular tank measuring 88 cm by 58 cm by 37 cm was to be filled with water by two taps, V and W. Tap V which fills the tank at a rate of 9 ℓ per minute was first turned on for 3 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 tank
= 88 x 58 x 37
= 188848 cm
3 1 ℓ = 1000 cm
3 9 ℓ = 9000 cm
3 Volume of water filled by Tap V
= 9000 x 5
= 45000 cm
3 Volume of water filled by Tap W
= 188848 - 45000
= 143848 cm
3 Rate in which Tap W fills the tank
= 143848 ÷ 2
= 71924 cm3/min
71924 mℓ/min
= 71.924 ℓ/min
≈ 71.9 ℓ/min (Correct to 1 decimal place)
Answer(s): 71.9 ℓ/min