A rectangular tank measuring 65 cm by 60 cm by 35 cm was ¹₁₀ filled with water. Diana turned on a tap at 5.10 p.m. to fill more water into the tank. She turned off the tap at 5.31 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
= ¹₁₀ x 65 x 60 x 35
= 13650 cm³

Volume of water in the tank in the end
= ⁷₁₀ x 65 x 60 x 35
= 95550 cm³

Volume of water added into the tank by the tap
= 95550 - 13650
= 81900 cm³

1000 mℓ = 1 ℓ
81900 mℓ = 81900 ÷ 1000 = 81.9 ℓ

From 5.10 p.m. to 5.31 p.m.: 21 min

Volume of water that flowed out of the tap in a minute
= 81.9 ÷ 21
= 3.9 ℓ 

Answer(s): 3.9 ℓ