Two runners A and B start together from the same point of a 600 m circular track and run in the same direction at 5 m/s and 8 m/s. After ho…

Two runners A and B start together from the same point of a 600 m circular track and run in the same direction at 5 m/s and 8 m/s. After how many seconds will they meet again for the first time at the starting point?