Four friends take turns driving on a road trip. Kelly drives 28 miles in the first half hour. John drives 82 miles in the following hour. Ebise then drives 58 miles in the next 45 minutes. Write an inequality to determine how many miles Eric can drive in the final 45 minutes of the trip so that the average speed over their whole trip does not exceed 70 miles per hour. Then explain how you can solve the inequality.​