Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Starting from one oasis, a camel walks 25 km in a direction 30° south of west and then walks 30 km toward the north to a second oasis. What is the direction from the first oasis to the second oasis?
A. 21° N of W
B. 39° W of N
C. 69° N of W
D. 51° W of N
E. 42° W of N
Answer: D
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