The figure shows a container made up of 3 sections. Cuboid D with a square base of side 14 cm and height 44 cm. Cube E with a side of 11 cm. Cuboid F that is 62 cm by 10 cm by 41 cm. Water from a tap above flows down at a rate of 3.3 litres per minute while water is drained out from the bottom at a rate of 1 litre per minute. How long did it take to fill up the container to a height of 64 cm from the base? Give the answer in minutes correct to nearest whole number.
Volume of E
= 11 x 11 x 11
= 1331 cm³ 

Volume of F
= 62 x 10 x 41
= 25420 cm³ 

1 ℓ = 1000 cm³ 
3.3 ℓ = 3300 cm³ 

Net increase in volume per minute
= 3300 - 1000
= 2300 cm³/min

Height of D to be filled with water
= 64 - (41 + 11)
= 12 cm

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

Volume of water in F, E and part of D
= 25420 + 1331 + 2352
= 29103 cm³ 

Time taken to reach height
= 29103 ÷ 2300
≈ 13 min (Correct to nearest whole number)

Answer(s): 13 min