You have jogged 5 miles from the park at a rate of r miles per hour. on your way back to the park your average speed increases by 1 mile per hour. a. write an expression for the time t (in hours) it takes to jog 5 miles from the park as a function of your average speed r (in miles per hour) b. when you run back to the park, your average speed increases by 1 mph. write an expression representing your new speed. c. write an expression for the time t(in hours) it takes to jog 5 miles back to the park. d. use your answers to parts a and c to write an expression that gives the total jogging time t (in hours) as a function of your average speed r (in miles per hour) when you are jogging away from the park. write your answer as a single rational expression. e. find the total jogging time if you jogged away from the park at an average speed (r) of 4 miles per hour. round your answer to the nearest tenth.