\[2.8 \cdot 1.25 = 3.5 \; м\]
\[3.5 \cdot 1.25 = 4.375 \; м\]
\[V = 2.8 \cdot 3.5 \cdot 4.375 = 42.875 \; м^3\]
Ответ: 42,875 м³