The figure shows a container made up of 3 sections. Cuboid D with a square base of side 14 cm and height 34 cm. Cube E with a side of 10 cm. Cuboid F that is 60 cm by 14 cm by 44 cm. Water from a tap above flows down at a rate of 3.1 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 E
= 10 x 10 x 10
= 1000 cm³ 

Volume of F
= 60 x 14 x 44
= 36960 cm³ 

2 ℓ = 2000 cm³ 
3.1 ℓ = 3100 cm³ 

Net increase in volume per minute
= 3100 - 2000
= 1100 cm³/min

Height of D to be filled with water
= 63 - (44 + 10)
= 9 cm

Volume of water in D
= 14 x 14 x 9
= 1764 cm³ 

Volume of water in F, E and part of D
= 36960 + 1000 + 1764
= 39724 cm³ 

Time taken to reach height
= 39724 ÷ 1100
≈ 36 min (Correct to nearest whole number)

Answer(s): 36 min