Question 1031185
The internal volume is 1m*1.5m^2m+3 m^3.

the external dimensions are 1.2 m wide and 2.2 m long and 1.6 m deep
This would be 4.224 m^3. If we subtract from that the 3 m^3 that is open, 1.224 m^3 of concrete is the volume.