Every morning, Star leaves her home to exercise. At $$\rm 6:30 a.m.$$, she leaves home and begins jogging at a speed of $$9$$ km per hour. At $$\rm 7:00 a.m.$$, she slows down and begins to walk at a speed of $$7.5$$ km per hour. At $$\rm 8:00 a.m.$$, she finishes her exercise. How many km does Star travel in total every morning? 
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