In a triathlon , Jenny swam for 1 hour , biked for 1.75 hours , and ran for 1 hour. Her average biking speed was 2 times her average running speed , and her average running speed was 8 times her average swimming speed. Total distance of the triathlon was 55.5 kilometers. Write an equation and solve it to find Jenny's average swimming speed in kilometers per hour. Explain your solution path and the reasoning behind your work.