A, B, and C start running simultaneously, starting from a point, around a circular track of length 900m, with respective speeds of 3m/s, 5m/s, and 6m/s. A and B run in the same direction while C runs in the opposite direction of the other two. After how much time will they meet for the first time?

A

12 minutes

B

13 minutes

C

14 minutes

D

15 minutes