Two ships left a port at the same time. One ship traveled at a speed of 19 miles per hour at a heading of 320°. The other ship traveled at a speed of 28 miles per hour at a heading of 197°. Find the distance between the two ships after 10 hours of travel. (Round your answer to the nearest mile.)

This is what I've got so far, but it didn't come out right according to my homework. Thoughts?

(280)^2 + (190)^2 - 2(280)(190)cos(83) = 101,533.1019 (take the square root of this number) = 318.6