Think of it like a graph. You start at the origin which is (0,0). go three to the east which now you are (3,0). Then, six to the north. Now, you are at (3,6). 1 to the east, ((4,6). Then you go 4 to the west which is back tracking. So, you end at (0,6) which is saying you are now 6 km north from your campsite.
Hope this helps!
Answer:
i would like to help you but I can't help you i don't understand the question and i don't speak Spanish
Answer:
It can be calculated from Snell's law by setting the refraction angle i.e. equal to 90°.
Hope it helps!
