Xiaoqiang and Xiaojun rode bicycles from the school to the opposite direction. After 1.5 hours, the distance between the two was 37.5 kilometers. Xiaoqiang travels 12 kilometers per hour, how many kilometers per hour does Xiaojun travel?
小强和小军骑自行车从学校向相反的方向骑去．1.5小时后两人相距37.5千米．小强每小时行12千米，小军每小时行多少千米？
<gadget id="calculator">37.5 / 1.5</gadget>
<output>25</output>

<gadget id="calculator">25 - 12</gadget>
<output>13</output>

<result>13</result>