A and B started running simultaneously from a point P in opposite directions along a circular track of radius 7 m. After every meeting, they exchange their speeds as well as directions. B started running with a speed thrice as that of A. They meet at point Q for the first time, at point R for the second time and at point S for the third time and so on. (Take π=22/7)

At how many different points on the track do they meet?