It takes Faucet L 15 minutes to fill a tank measuring 18 cm by 10 cm by 14 cm completely while it takes Faucet Q only 10 minutes. How long will it take to completely fill the tank with water if both faucets are turned on at the same time and 4 cubic cubes of edges 2 cm, filled with water, are poured into the tank? Leave the answer in minutes and round off to 2 decimal places.
Time taken by Faucet L to fill the tank:

15 min → 1 tank
1 min → ¹₁₅ tank

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

Volume of the tank
= 18 x 10 x 14
= 2520 cm³

Volume of 4 cubic cubes
= 4 x (2 x 2 x 2)
= 32 cm³

Time taken by Faucet L and Faucet Q to fill a tank:
1 min → ¹₁₅ + ¹₁₀ =⁵₃₀ = ¹₆ tank

¹₆ tank → 1 min
1 tank → 1 ÷ ¹₆ = 1 x ⁶₁ = 6 min

Remaining volume of the tank to be filled by both faucets 
= 2520 - 32
= 2488 cm³

Time taken to fill the tank
= ²⁴⁸⁸₂₅₂₀ x 6
= 5.9238095238095
≈ 5.92 min

Answer(s): 5.92 min