To fill a tank measuring 50 cm by 20 cm by 20 cm completely, it takes Tap M 6 minutes while it takes Tap N only 14 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 10 cm, filled to the brim with water are poured into the tank?
Volume of the tank 
= 50 x 20 x 20
= 20000 cm³

Volume of 8 containers
= 10 x 10 x 10 x 8
= 8000 mℓ

Remaining volume to be filled by the Tap M and Tap N 
= 20000 - 8000
= 12000 mℓ
= 12000 cm³

Fraction of the tank to be filled
= ¹²⁰⁰⁰₂₀₀₀₀
= ³₅

Tap M:
1 tank → 6 min
1 min → ¹₆ tank

Tap N:
1 tank → 14 min
1 min → ¹₁₄ tank

Tap M and Tap N:
1 min → ¹₆ + ¹₁₄ = ⁷₄₂ + ³₄₂ = ⁵₂₁ tank
1 tank → ²¹₅ min

³₅ tank → ²¹₅ x ³₅ = ⁶³₂₅ = 2.52 min

Answer(s): 2.52 min