Final answer:
The total surface area of the water tank is 11,800 m².
Step-by-step explanation:
To calculate the total surface area of the water tank, we need to find the area of each of the six faces and then add them together. The area of a cuboid face can be found by multiplying its length by its width.
Given that the length is 60 m, the breadth is 50 m, and the height is 40 m, we can calculate the total surface area as follows:
Face 1: 60 m x 50 m = 3000 m²
Face 2: 60 m x 50 m = 3000 m²
Face 3: 60 m x 40 m = 2400 m²
Face 4: 60 m x 40 m = 2400 m²
Face 5: 50 m x 40 m = 2000 m²
Face 6: 50 m x 40 m = 2000 m²
Total surface area: 3000 m² + 3000 m² + 2400 m² + 2400 m² + 2000 m² + 2000 m² = 11800 m²
The total surface area of the water tank is 11800 m².