The volume \( V \) of a rectangular pyramid can be calculated using the formula:
\[ V = \frac{1}{3} \times B \times h \]
where \( B \) is the area of the base and \( h \) is the height of the pyramid.
In this case, the area of the base \( B = 325 \) square meters and the height \( h = 75 \) meters.
Substituting these values into the formula:
\[ V = \frac{1}{3} \times 325 , \text{m}^2 \times 75 , \text{m} \]
Calculating the product:
\[ 325 \times 75 = 24375 , \text{m}^3 \]
Now, divide by 3 to find the volume:
\[ V = \frac{24375}{3} = 8125 , \text{m}^3 \]
Thus, the volume of the rectangular pyramid is
\[ \boxed{8125} , \text{cubic meters}. \]