To fill a tank measuring 30 cm by 70 cm by 43 cm completely, it takes Tap L 46 minutes while it takes Tap M 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 6 cubic containers of edges 10 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 
= 30 x 70 x 43
= 90300 cm³
= 90300 mℓ

Volume of 6 containers
= 10 x 10 x 10 x 6
= 6000 cm³ 
= 6000 mℓ

Remaining volume to be filled by the Tap L and Tap M 
= 90300 - 6000
= 84300 mℓ
= 84300 cm³

Fraction of the tank to be filled
= ⁸⁴³⁰⁰₉₀₃₀₀
= ²⁸¹₃₀₁

Tap L:
1 tank → 46 min
1 min → ¹₄₆ tank

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

Tap L and Tap M:
1 min → ¹₄₆ + ¹₄₃ = ⁴³₁₉₇₈ + ⁴⁶₁₉₇₈ = ⁸⁹₁₉₇₈ tank

1 tank = ¹⁹⁷⁸₈₉ min

²⁸¹₃₀₁ tank = ¹⁹⁷⁸₈₉ x ²⁸¹₃₀₁ = ⁵¹⁸⁷₂₅₀ = 20.748

Answer(s): 20.75 min