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 distance separates the two oases?
A. 15 km
B. 48 km
C. 28 km
D. 53 km
E. 55 km
Answer: C
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