Make a conjecture about the relationship between a and b if ab=1

Which statements about these triangles is true

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?