Volume of a rectanglular box is
Volume = l x b x h
where l is length b is breadth and h is height
hope the question is to determine the height when length and breadth is 9.6 cm
Volume V = 144 ,given
144= 9.6 x 9.6 x h
144 = 92.16 x h
therefore
h = 144/92.16
h = 1.5 cm