Surveying and Levelling

A railway embankment cutting has three cross-sectional areas spaced $20\text{ m}$ apart ($h = 20\text{ m}$): $A_0 = 40\text{ m}^2$, $A_1 = 65\text{ m}^2$, and $A_2 = 50\text{ m}^2$. Using Simpson's prismoidal rule $V = \frac{h}{3} (A_0 + 4 A_1 + A_2)$, calculate the volume of earthwork in $\text{m}^3$.