A boat leaves New Orleans and travels upstream on the Mississippi river for 4 hours. The return trip only takes 2.8 hours because the boat travels 3 miles per hour faster downstream due to the current. How far does the boat travel upstream?

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.