A boater retraces the first part of the Lewis and Clark journey from near St. Louis, Missouri, to the first lock at Sioux City, Iowa, a distance of about 1200 km. The trip going upstream against the current requires 50 hours on the river. The return trip to St. Louis takes 30 hours on the river. What is c, the speed of the current of the river? What is b, the speed that the boat would have if there were no current? Assume that throughout the trip that c does not vary and b does not vary.

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