Deangelo is training for a half marathon. today he is running 13.25 miles. he jogs for the first half hour at a rate of 5.5 miles per hour, then increases his pace to p miles per hour for 1.5 hours. write an equation representing this situation, and complete the statement that follows. + p = deangelo's rate for the last 1.5 hours of his run is miles per hour.