A, B and C start running on a circular t...

A, B and C start running on a circular track simultaneously from the same place of the circular track at the speed of 30 m/s, 60 m/s and 40 m/s respectively in the same direction. The circumference of the track is 1200 m.
(i) When will they be together again for the first time ?
(ii) When will they be together again for the first time at the starting point?

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