To fill a tank measuring 30 cm by 60 cm by 40 cm completely, it takes Tap V 36 minutes while it takes Tap W only 28 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 12 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 60 x 40
= 72000 cm³
= 72000 mℓ

Volume of 5 containers
= 12 x 12 x 12 x 5
= 8640 cm³ 
= 8640 mℓ

Remaining volume to be filled by the Tap V and Tap W 
= 72000 - 8640
= 63360 mℓ
= 63360 cm³

Fraction of the tank to be filled
= ⁶³³⁶⁰₇₂₀₀₀
= ²²₂₅

Tap V:
1 tank → 36 min
1 min → ¹₃₆ tank

Tap W:
1 tank → 28 min
1 min → ¹₂₈ tank

Tap V and Tap W:
1 min → ¹₃₆ + ¹₂₈ = ⁷₂₅₂ + ⁹₂₅₂ = ⁴₆₃ tank

1 tank = ⁶³₄ min

²²₂₅ tank = ⁶³₄ x ²²₂₅ = ⁶⁹³₅₀ = 13.86

Answer(s): 13.86 min