Physics Physics Physics short question? help ?????? thanks?

What is the velocity of car 2 relative to car 1? Help Physics question??Thanks :)? Two cars approach a street corner at right angles to each other. Car 1 travels at a speed relative to Earth v1E = 27 km/h, and car 2 at v2E = 51 km/h. (a). What is the relative velocity of car 1 as seen by car 2? 57.71 km/h;... show more What is the velocity of car 2 relative to car 1? Help Physics question??Thanks :)?
Two cars approach a street corner at right angles to each other. Car 1 travels at a speed relative to Earth v1E = 27 km/h, and car 2 at v2E = 51 km/h.

(a). What is the relative velocity of car 1 as seen by car 2?
57.71 km/h; 62.103° (west of north)

(b). What is the velocity of car 2 relative to car 1?
........km/h;.......° (south of east)

Please help me to do this Physics Question? i got the first questions and it turns out to be right..but how do i get the velocity of car 2 relative to car 1?????????? please show the work also ..Thanks :)