two sailboats are traveling along the same path away from the dock, beginning from different locations at the same time. Johns boat begins 25 miles from the dock and is 55 miles from the dock after 5 hours. The distance of Robertas boat from dock is represented in the function y=5x+30, where x represents time and y represents the distance from the dock. Which boat was farther from the dock at the beginning, and which traveled more quickly?