Verified Answer :

The formula for the volume of a rectangular prism is V = lwh, lengthwidthheight. 
Let's insert the given information into the formula.

186 = lengthwidth1.6

The length and the width are in the formula, and area is lengthwidth, so you can find the area. 

Divide by 1.6 on both sides.
116.25 = length
width
116.25 = Area

The area is 116.25 cm^3