Your prism has the dimensions of two cubes adjacent to each other. Each of those cubes would be 54 m3/2 = 27 m3, which means they have a dimension of 3 m per side. Thus, the length of your prism is 6 m, twice the width or height, which are each 3 m.
How To Find The Length Of A Rectangular Prism That Has A Volume Of 54 Cubic Meters And A Length Which Is Twice The Width And Height.?