Question

Chris made a wooden box to store his garden tools. It had two chambers shaped as rectangular prisms with a lid on each as shown below. A prism resembling a two-step box is composed of two rectangular solids of different heights and aligned lengthwise. The combined width is 28 inches and the length of the smaller box is shown as 20 inches. The height of the taller box is 18 inches and its width is 14 inches. The top face of the smaller box is 8 inches below the top face of the taller box. What is the total volume of Chris’ garden tool box?