A and B are riding bicycles at a distance of 65 kilometers, and they meet each other in 2 hours. A rides 2.5 kilometers more than B per hour. How many kilometers does B ride per hour?
甲乙骑自行车同时囱65千米的两地相向而行，2小时相遇，甲比乙每小时多骑2.5千米，求乙每小时骑多少千米？
<gadget id="calculator">65 / 2</gadget>
<output>65/2 = around 32.5</output>

<gadget id="calculator">(65/2) - 2.5</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>