Answer: 6 min
Explanation:
First, we need to find the volume of the tank. The base is a square with sides of 30 cm, so the area of the base is:
30 cm x 30 cm = 900 cm²
The volume of the tank is:
900 cm² x 40 cm = 36,000 cm³
There are 1,000 cubic centimeters in a liter, so the volume of the tank in liters is:
36,000 cm³ ÷ 1,000 cm³/L = 36 L
The water is flowing at a rate of 6 liters per minute, so the time it will take to fill the tank completely is:
36 L ÷ 6 L/min = 6 minutes
Therefore, it will take 6 minutes to fill the tank completely.