Ten cubits was the length of one panel, and one and one half cubits comprised the width
Other versions
King James Version
The length of a board was ten cubits, and the breadth of a board one cubit and a half.English Standard Version
Ten cubits was the length of a frame, and a cubit and a half the breadth of each frame.New International Version
Each frame was ten cubits long and a cubit and a half wide,