A rectangular tank measuring 80 cm by 75 cm by 24 cm was ¹₅ filled with water. Penelope turned on a tap at 10.15 p.m. to fill more water into the tank. She turned off the tap at 10.35 p.m. The tank was ⁷₁₀ 
filled with water. Given that the water flowed out of the tap at the same rate, find the volume of water that flowed out of the tap in a minute. Give your answer in litres.
Volume of water in the tank at first
= ¹₅ x 80 x 75 x 24
= 28800 cm³

Volume of water in the tank in the end
= ⁷₁₀ x 80 x 75 x 24
= 100800 cm³

Volume of water added into the tank by the tap
= 100800 - 28800
= 72000 cm³

1000 mℓ = 1 ℓ
72000 mℓ = 72000 ÷ 1000 = 72 ℓ

From 10.15 p.m. to 10.35 p.m.: 20 min

Volume of water that flowed out of the tap in a minute
= 72 ÷ 20
= 3.6 ℓ 

Answer(s): 3.6 ℓ