3 friends A, B & C run on a circular track of 30 km with a speed of 5kmph, 7kmph & 8kmph respectively . They started from a point of that track A & B run clockwise whereas C runs anticlockwise at same time. So find out after how many hours they all meet again?
A. 25 hours
B. 15 hours
C. 30 hours
D. 20 hours
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