Easy Algebra question?

I'm doing this simple algebra question and i'm positive that I have the right answer, but for some reason this book says that the answer is wrong.The question is the distance between two cities, on a map, is 8.5 inches. 1.5 inches is equal to 25 miles. How many miles is the distance between the two cities?Thanks thats exactly what i got the book says its 300.141.66667 is the answer I always get but Id have to call the publisher of this damn book lol.