A rectangular tank measuring 60 cm by 50 cm by 20 cm was ¹₁₀ filled with water. Dana turned on a tap at 8.19 p.m. to fill more water into the tank. She turned off the tap at 8.40 p.m. The tank was ⁵₈ 
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
= ¹₁₀ x 60 x 50 x 20
= 6000 cm³

Volume of water in the tank in the end
= ⁵₈ x 60 x 50 x 20
= 37500 cm³

Volume of water added into the tank by the tap
= 37500 - 6000
= 31500 cm³

1000 mℓ = 1 ℓ
31500 mℓ = 31500 ÷ 1000 = 31.5 ℓ

From 8.19 p.m. to 8.40 p.m.: 21 min

Volume of water that flowed out of the tap in a minute
= 31.5 ÷ 21
= 1.5 ℓ 

Answer(s): 1.5 ℓ