To fill a tank measuring 60 cm by 40 cm by 43 cm completely, it takes Tap B 22 minutes while it takes Tap C only 43 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 7 cubic containers of edges 13 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 
= 60 x 40 x 43
= 103200 cm³
= 103200 mℓ

Volume of 7 containers
= 13 x 13 x 13 x 7
= 15379 cm³ 
= 15379 mℓ

Remaining volume to be filled by the Tap B and Tap C 
= 103200 - 15379
= 87821 mℓ
= 87821 cm³

Fraction of the tank to be filled
= ⁸⁷⁸²¹₁₀₃₂₀₀
= ¹⁹¹³₂₂₄₈

Tap B:
1 tank → 22 min
1 min → ¹₂₂ tank

Tap C:
1 tank → 43 min
1 min → ¹₄₃ tank

Tap B and Tap C:
1 min → ¹₂₂ + ¹₄₃ = ⁴³₉₄₆ + ²²₉₄₆ = ⁶⁵₉₄₆ tank

1 tank = ⁹⁴⁶₆₅ min

¹⁹¹³₂₂₄₈ tank = ⁹⁴⁶₆₅ x ¹⁹¹³₂₂₄₈ = ²⁴⁷⁷₂₀₀ = 12.385

Answer(s): 12.39 min