To fill a tank measuring 40 cm by 10 cm by 17 cm completely, it takes Tap C 25 minutes while it takes Tap D only 33 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 6 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 10 x 17
= 6800 cm³
= 6800 mℓ

Volume of 5 containers
= 6 x 6 x 6 x 5
= 1080 cm³ 
= 1080 mℓ

Remaining volume to be filled by the Tap C and Tap D 
= 6800 - 1080
= 5720 mℓ
= 5720 cm³

Fraction of the tank to be filled
= ⁵⁷²⁰₆₈₀₀
= ¹⁴³₁₇₀

Tap C:
1 tank → 25 min
1 min → ¹₂₅ tank

Tap D:
1 tank → 33 min
1 min → ¹₃₃ tank

Tap C and Tap D:
1 min → ¹₂₅ + ¹₃₃ = ³³₈₂₅ + ²⁵₈₂₅ = ⁵⁸₈₂₅ tank

1 tank = ⁸²⁵₅₈ min

¹⁴³₁₇₀ tank = ⁸²⁵₅₈ x ¹⁴³₁₇₀ = ²³⁹³₂₀₀ = 11.965

Answer(s): 11.97 min