explain why towns like Greenville and Chambersburg and Shippensburg are approximately 10 miles apart from another

The towns like Chambersburg, Green Village, and Shippensburg are approximately 10 miles apart from each other because the settlers of the Green Village chose to settle at a location central to both the larger towns of Chambersburg and Shippensburg.

Explanation:

The town of Shippensburg which settled in 1730 was one of the first town settlements in the valley of Cumberland. The town of Chambersburg shortly settled at a distance of only a few miles from the town of Shippensburg. After a few years, the settlers of the present-day Green Village chose to settle at a location that was central to both these larger towns. Thus, the towns of Chambersburg, Green Village, and Shippensburg fall approximately 10 miles apart from each other.