SSC JE Civil Engineering 2013 Solved Paper

Volume of excavation at section A-A = 80 cm × 60 cm = 4800 $\mathit{c}{\mathit{m}}^2$
Perimeter of excavation
= 4 + 4 + 2 (6 – (2 × .8 m))
= 4 + 4 + 8.8 = 16.8 m
Volume of whole excavation $=\frac{4800}{{100}^2}\times 16.8\mathit{m}$
$=8.064{\mathit{m}}^3$ or = 8.064 cu.m