One day morning, Susan goes out to exercise. At $$\rm 7:30$$ a.m., Susan leaves home and jogs at a speed of $$5$$ miles per hour. At $$\rm 8:30 $$ a.m., Susan feels a little bit tired and walks at a speed of $$3$$ miles per hour. At $$\rm 10:30$$ a.m., Susan finishes her exercise. How many miles does Susan travel in total this morning? 
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