Grayson was doing his chores for his family. He was moving firewood from the truck bed to the woodpile. The distance between the truck bed and the woodpile is 43.7 meters. He hoped to finish his chores in half an hour because he wanted to go to the game with his friends. Grayson made seven round trips and finished after exactly 30 minutes. What was his average speed in meters per hours as he moved the firewood?