An ostrich farmer wants to enclose a rectangular area and then divide it into six pens with fencing parallel to one side of the rectangle (see the figure below). There are 620 feet of fencing available to complete the job. What is the largest possible total area of the six pens?

$$\begin{array}{|c|c|c|c|c|c|} \hline & & & & & \\ \hline \end{array}$$

Largest area = (include units)