The figure shows a rectangular container measuring 29 cm by 33 cm by 21 cm. Natalie poured 629 mℓ of water into the container. Then, she turned on two taps at the same time to fill up the container with water. Water was flowing from both taps at the same rate. After 13 minutes, both taps were turned off but 3.1 ℓ of water had overflowed and was collected in a tray. Find the rate of the flow of water of each tap in millilitres per minute.
Volume of the container
= 29 x 33 x 21
= 20097 cm³
= 20097 mℓ

Volume of the remaining space after water was poured in
= 20097 - 629
= 19468 mℓ 

1 ℓ = 1000 mℓ
3.1 ℓ = 3100 mℓ

Volume of water contributed by 2 taps
= 19468 + 3100
= 22568 mℓ

Volume of water contributed by 1 tap
= 22568 ÷ 2 
= 11284 mℓ 

Rate of flow per minute
= 11284 ÷ 13
= 868 mℓ/min

Answer(s): 868 mℓ/min