Answer: 
240 cubic inches
Explanation:
Size of each cube = 1/4 inch
Dimensions of a cube = Length * Breadth * Height 
 = x^3
Area of each cube = 1/4^3
 = 1/4 * 1/4 * 1/4
 = 1/4*4*4
 = 1/64 cubic inches
Number of cubes in the box = 960 cubes
Volume of the box = Number of cubes in the box * Area of each cube
 = 960*1/4
 = 960/4
 = 240 cubic inches