It takes Faucet Q 15 minutes to fill a tank measuring 18 cm by 12 cm by 13 cm completely while it takes Faucet V 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 6 cubic cubes of edges 3 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 Q to fill the tank:

15 min → 1 tank
1 min → ¹₁₅ tank

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

Volume of the tank
= 18 x 12 x 13
= 2808 cm³

Volume of 6 cubic cubes
= 6 x (3 x 3 x 3)
= 162 cm³

Time taken by Faucet Q and Faucet V 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 
= 2808 - 162
= 2646 cm³

Time taken to fill the tank
= ²⁶⁴⁶₂₈₀₈ x 6
= 5.6538461538462
≈ 5.65 min

Answer(s): 5.65 min