hey, correct me if am wrong
vol of prism = area of base * height
= ( Length * breadth ) * height , so basically it is a cuboid
so, in similar figures the ratio is mainatined..
so, if breadth is 1/2 factor of larger prism then length and height must be 1/2
so, Vol of smaller will be = V / ( 2^3)
= 4320/8 =540 cm cube