To fill a tank measuring 40 cm by 50 cm by 22 cm completely, it takes Tap E 21 minutes while it takes Tap F only 28 minutes. How long will it take to completely fill the container with water if both the taps are turned on at the same time and 5 cubic containers of edges 11 cm, filled to the brim with water are poured into the tank? Leave your answer in minutes and round off to 2 decimal places.
Volume of the tank 
= 40 x 50 x 22
= 44000 cm³
= 44000 mℓ

Volume of 5 containers
= 11 x 11 x 11 x 5
= 6655 cm³ 
= 6655 mℓ

Remaining volume to be filled by the Tap E and Tap F 
= 44000 - 6655
= 37345 mℓ
= 37345 cm³

Fraction of the tank to be filled
= ³⁷³⁴⁵₄₄₀₀₀
= ⁶⁷⁹₈₀₀

Tap E:
1 tank → 21 min
1 min → ¹₂₁ tank

Tap F:
1 tank → 28 min
1 min → ¹₂₈ tank

Tap E and Tap F:
1 min → ¹₂₁ + ¹₂₈ = ⁴₈₄ + ³₈₄ = ¹₁₂ tank

1 tank = ¹²₁ min

⁶⁷⁹₈₀₀ tank = ¹²₁ x ⁶⁷⁹₈₀₀ = ²⁰³⁷₂₀₀ = 10.185

Answer(s): 10.19 min