The distance between the two cities is 103 kilometers. Two people, A and B, start from the two cities at the same time and walk towards each other on bicycles. They meet after 4 hours. It is known that A travels 12.5 kilometers per hour, how many kilometers per hour does B travel?
两城相距103千米，甲乙两人骑自行车分别从两城同时出发相对而行，4小时后相遇，已知甲每小时行12.5千米，乙每小时行多少千米？
<result>13.75</result>