Two people walk toward each other from two places at the same time. The distance between the two places is 6400 meters. A is 70 meters away from each branch, and B is 90 meters away from each branch. After a few minutes, the two meet?
两人同时从两地相向而行，两地相距6400米，甲每分行70米，乙每分行90米，经过几分钟两人相遇？
<result>4</result>