It takes Faucet J 40 minutes to fill a container measuring 16 cm by 9 cm by 15 cm completely while it takes Faucet Z only 10 minutes. How long will it take to completely fill the container with water if both faucets are turned on at the same time and 3 cubic cubes of edges 2 cm, filled with water, are poured into the container? Leave the answer in minutes and round off to 2 decimal places.
Time taken by Faucet J to fill the container:

40 min → 1 tank
1 min → ¹₄₀ tank

Time taken by Faucet Z to fill the container:
10 min → 1 tank
1 min → ¹₁₀ tank

Volume of the container
= 16 x 9 x 15
= 2160 cm³

Volume of 3 cubic cubes
= 3 x (2 x 2 x 2)
= 24 cm³

Time taken by Faucet J and Faucet Z to fill a container:
1 min → ¹₄₀ + ¹₁₀ =⁵₄₀ = ¹₈ container

¹₈ container → 1 min
1 container → 1 ÷ ¹₈ = 1 x ⁸₁ = 8 min

Remaining volume of the container to be filled by both faucets 
= 2160 - 24
= 2136 cm³

Time taken to fill the container
= ²¹³⁶₂₁₆₀ x 8
= 7.9111111111111
≈ 7.91 min

Answer(s): 7.91 min