To fill a tank measuring 40 cm by 40 cm by 10 cm completely, it takes Tap C 32 minutes while it takes Tap D 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 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 
= 40 x 40 x 10
= 16000 cm³
= 16000 mℓ

Volume of 7 containers
= 10 x 10 x 10 x 7
= 7000 cm³ 
= 7000 mℓ

Remaining volume to be filled by the Tap C and Tap D 
= 16000 - 7000
= 9000 mℓ
= 9000 cm³

Fraction of the tank to be filled
= ⁹⁰⁰⁰₁₆₀₀₀
= ⁹₁₆

Tap C:
1 tank → 32 min
1 min → ¹₃₂ tank

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

Tap C and Tap D:
1 min → ¹₃₂ + ¹₄₃ = ⁴³₁₃₇₆ + ³²₁₃₇₆ = ⁷⁵₁₃₇₆ tank

1 tank = ¹³⁷⁶₇₅ min

⁹₁₆ tank = ¹³⁷⁶₇₅ x ⁹₁₆ = ²⁵⁸₂₅ = 10.32

Answer(s): 10.32 min