46. The distance between $A$ and $B$ is 1000 meters. Person 甲 starts from $A$ and person 乙 starts from $B$, both starting at the same time and moving back and forth between $A$ and $B$. 甲 runs at a speed of 150 meters per minute, and 乙 walks at a speed of 60 meters per minute. Within 30 minutes, 甲 and 乙 meet for the $\qquad$th time at the point closest to $A$.
answer: 3