The figure shows a container made up of 3 sections. Cuboid E with a square base of side 25 cm and height 45 cm. Cube F with a side of 11 cm. Cuboid G that is 70 cm by 24 cm by 42 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 63 cm from the base? Give the answer in minutes correct to nearest whole number.
Volume of F
= 11 x 11 x 11
= 1331 cm³ 

Volume of G
= 70 x 24 x 42
= 70560 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
= 63 - (42 + 11)
= 10 cm

Volume of water in E
= 25 x 25 x 10
= 6250 cm³ 

Volume of water in G, F and part of E
= 70560 + 1331 + 6250
= 78141 cm³ 

Time taken to reach height
= 78141 ÷ 300
≈ 260 min (Correct to nearest whole number)

Answer(s): 260 min