The figure shows a container made up of 3 sections. Cuboid E with a square base of side 14 cm and height 25 cm. Cube F with a side of 12 cm. Cuboid G that is 74 cm by 17 cm by 44 cm. Water from a tap above flows down at a rate of 2.3 litres per minute while water is drained out from the bottom at a rate of 2 litre per minute. How long did it take to fill up the container to a height of 68 cm from the base? Give the answer in minutes correct to nearest whole number.
Volume of F
= 12 x 12 x 12
= 1728 cm³ 

Volume of G
= 74 x 17 x 44
= 55352 cm³ 

2 ℓ = 2000 cm³ 
2.3 ℓ = 2300 cm³ 

Net increase in volume per minute
= 2300 - 2000
= 300 cm³/min

Height of E to be filled with water
= 68 - (44 + 12)
= 12 cm

Volume of water in E
= 14 x 14 x 12
= 2352 cm³ 

Volume of water in G, F and part of E
= 55352 + 1728 + 2352
= 59432 cm³ 

Time taken to reach height
= 59432 ÷ 300
≈ 198 min (Correct to nearest whole number)

Answer(s): 198 min