The distance between the two places is 125.1 kilometers. Two people, A and B, start from the two places at the same time and walk towards each other. They meet 4.5 hours after departure. It is known that A travels 12.5 kilometers per hour, and how many kilometers per hour does B travel?
两地相距125.1千米，甲乙两人骑自行车分别从两地同时出发相对而行，出发后4.5小时相遇，已知甲每小时行12.5千米，乙每小时行多少千米？
<gadget id="calculator">125.1 / 4.5</gadget>
<output>27.8</output>

<gadget id="calculator">27.8 - 12.5</gadget>
<output>15.3</output>

<result>15.3</result>