The volume of the rectangular tank is:
V = l × w × h = 40 cm × 30 cm × 35 cm = 42,000 cm³
The initial volume of water in the tank is:
V1 = l × w × h1 = 40 cm × 30 cm × 15 cm = 18,000 cm³
When 4800 cm³ of water is poured into the tank, the new volume of water becomes:
V2 = V1 + 4800 cm³ = 18,000 cm³ + 4800 cm³ = 23,800 cm³
Let's assume that the new water height is h2 cm. We can use the formula for the volume of a rectangular tank to find the new height:
V = l × w × h2
h2 = V / (l × w) = (23,800 cm³) / (40 cm × 30 cm) ≈ 19.83 cm
Therefore, the new height of the water in the tank is approximately 19.83 cm.