A particle moves towards east at 12kmph for 1 hr and then turns towards north and moves at 5kmph for another hr. Find the average speed.
A. 8.5kmph
B. 6.5kmph
C. 6.5kmph at tan inverse 5/12N of E
D. 6.5kmph at tan inverse 5/12E of N
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the answer is option A .
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