To fill a tank measuring 60 cm by 60 cm by 48 cm completely, it takes Tap X 49 minutes while it takes Tap Y only 49 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 8 cubic containers of edges 18 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 60 x 48
= 172800 cm³
= 172800 mℓ

Volume of 8 containers
= 18 x 18 x 18 x 8
= 46656 cm³ 
= 46656 mℓ

Remaining volume to be filled by the Tap X and Tap Y 
= 172800 - 46656
= 126144 mℓ
= 126144 cm³

Fraction of the tank to be filled
= ¹²⁶¹⁴⁴₁₇₂₈₀₀
= ⁷³₁₀₀

Tap X:
1 tank → 49 min
1 min → ¹₄₉ tank

Tap Y:
1 tank → 49 min
1 min → ¹₄₉ tank

Tap X and Tap Y:
1 min → ¹₄₉ + ¹₄₉ = ¹₄₉ + ¹₄₉ = ²₄₉ tank

1 tank = ⁴⁹₂ min

⁷³₁₀₀ tank = ⁴⁹₂ x ⁷³₁₀₀ = ³⁵⁷⁷₂₀₀ = 17.885

Answer(s): 17.89 min