The figure shows a rectangular tank measuring 28 cm by 39 cm by 39 cm. Gem poured 748 mℓ of water into the tank. Then, she turned on two taps at the same time to fill up the tank with water. Water was flowing from both taps at the same rate. After 15 minutes, both taps were turned off but 2.8 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 tank
= 28 x 39 x 39
= 42588 cm³
= 42588 mℓ

Volume of the remaining space after water was poured in
= 42588 - 748
= 41840 mℓ 

1 ℓ = 1000 mℓ
2.8 ℓ = 2800 mℓ

Volume of water contributed by 2 taps
= 41840 + 2800
= 44640 mℓ

Volume of water contributed by 1 tap
= 44640 ÷ 2 
= 22320 mℓ 

Rate of flow per minute
= 22320 ÷ 15
= 1488 mℓ/min

Answer(s): 1488 mℓ/min