Displacement and velocity are both vectors so only the initial and final points count, not distance traveled.
Here is what you have:
+0.219 km right (positive x axis)
-1.42 km south (negative y axis)
And 4.76 km north of west which must be broken down into x and y components:
The x component is cosine of the angle (75.4) multiplied by 4.76, while the y component is sine of the angle multiplied by 4.76
Since it is northwest the x component will be negative and y will be positive.
Now you need to add your x components together and your y components together and draw it on a piece of paper (be careful with signs).
Now using pythagoreans theorem (x^2 + y^2 = z^2) to find the total displacement.
If you have to be in SI units (meters and seconds) divide displacement by 1000 and multiply time 1.616 by 3600).
Then just solve for velocity
If anything is unclear, edit your question and let me know...
I don't give solutions onY! Answers, I just provide the required inforation to allow them to be found.