Bluebook试题4 · 第 21 题

Two identical rectangular prisms each have a height of 90 centimeters (cm). The base of each prism is a square, and the surface area of each prism is K cm². If the prisms are glued together along a square base, the resulting prism has a surface area of \(\frac{92}{47}\)K cm². What is the side length, in cm, of each square base?