Two sailboats are traveling along the same path away from a dock, beginning from different locations at the same time. John's boat begins 20 miles away from the dock and is 55 miles from the dock after 5 hours. The distance of Roberta's boat from the dock is represented by the function y=6x+10, where x represents time and y represents the distance from the dock Which boat was further from the dock at the beginning, and which traveled more quickly?