There are three people A, B, and C. A walks 100 meters per minute, B walks 80 meters per minute, and C walks 75 meters per minute. Now A starts from the East Village, and B and C walk towards each other when they start from the West Village. Six minutes after A and B meet, A and C meet. May I ask: How long does A meet B after departure?
有甲、乙、丙三人，甲每分钟走100米，乙每分钟走80米，丙每分钟走75米，现在甲从东村，乙、丙两人从西村间时出发相向而行，在甲与乙相遇6分钟后，甲与丙相遇，请问：甲出发后多长时间与乙相遇？
<result>3.5</result>