9. The average speed (or rate) on a round trip commute between two fixed points having a distance of d is given by the complex rational expression: 2d Here, ri and r2 are the speed (or rates) on the outgoing and return trips, respec- tively. Using that answer the following: a) Simplify the complex rational expression and write as a single fraction. (Hint: It will only contain the ri and r2 terms) b) Find your average speed if you drive to campus averaging 30mph and re- turn home on the same route averaging 40mph. Use the simplified rational expression from (a).

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