A rectangular tank measuring 80 cm by 70 cm by 34 cm was ¹₇ filled with water. Ivory 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 ⁶₇ 
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
= ¹₇ x 80 x 70 x 34
= 27200 cm³

Volume of water in the tank in the end
= ⁶₇ x 80 x 70 x 34
= 163200 cm³

Volume of water added into the tank by the tap
= 163200 - 27200
= 136000 cm³

1000 mℓ = 1 ℓ
136000 mℓ = 136000 ÷ 1000 = 136 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
= 136 ÷ 20
= 6.8 ℓ 

Answer(s): 6.8 ℓ