To fill a tank measuring 40 cm by 70 cm by 20 cm completely, it takes Tap D 48 minutes while it takes Tap E only 35 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 10 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 
= 40 x 70 x 20
= 56000 cm³
= 56000 mℓ

Volume of 10 containers
= 13 x 13 x 13 x 10
= 21970 cm³ 
= 21970 mℓ

Remaining volume to be filled by the Tap D and Tap E 
= 56000 - 21970
= 34030 mℓ
= 34030 cm³

Fraction of the tank to be filled
= ³⁴⁰³⁰₅₆₀₀₀
= ¹⁰¹³₁₆₆₇

Tap D:
1 tank → 48 min
1 min → ¹₄₈ tank

Tap E:
1 tank → 35 min
1 min → ¹₃₅ tank

Tap D and Tap E:
1 min → ¹₄₈ + ¹₃₅ = ³⁵₁₆₈₀ + ⁴⁸₁₆₈₀ = ⁸³₁₆₈₀ tank

1 tank = ¹⁶⁸⁰₈₃ min

¹⁰¹³₁₆₆₇ tank = ¹⁶⁸⁰₈₃ x ¹⁰¹³₁₆₆₇ = ¹²³₁₀ = 12.3

Answer(s): 12.30 min