You are taking a six hour train ride. during the first hour of the trip, the train moves at an average of 65 mph. during the second part of the trip, the train moves at an average speed of 40 mph. let t be the time it takes for the train to travel the first part of the trip. write and simplify an expression in terms of t for the total distance you traveled in the train. then find a total distance you traveled if the first part of the trip took four hours.