From a point on a circular track of 12 km long, A, B and C started running in the same direction

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From a point on a circular track of 12 km long, A, B and C started running in the same direction at the same time with speed of 4 km/h, 3 km/h and 2 km/h respectively. Then on the starting point, all three will meet again after ?

(A) 3 h
(B) 4 h
(C) 6 h
(D) 12 h

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