Let's draw an illustration of the question.
As we can see above, the 3:00 time is straight to the left of the center. If the center is the origin and the hour hand is 4 units, then the coordinate at the end of the hour is (4, 0).
For 8:00, we have:
The end of the hour hand is located 4 units down from the origin. Hence, its coordinate at 08:00 is (0, 4).
Lastly, for