Two people, A and B, start from A and B at the same time and walk toward each other. A travels 12.5 kilometers per hour, and B travels 10 kilometers per hour. 30 minutes later, Bank A arrived at the gate of Hang Seng Bank, and remembered that he did not bring his credit card, so he returned to place A at the same speed to get the card. After arriving at place A, A forgot where the card was placed, and spent half an hour looking for the card. After finding the card, A goes to point B at the same speed. As a result, when B arrives at point A, it still takes 15 minutes for A to reach point B. So how many miles is the distance between A and B?
甲、乙两人同时从A、B两地出发，相向而行，甲每小时行12.5千米，乙每小时行10千米．甲行30分钟后，到达恒生银行门口，想起来自己的信用卡没有带，所以他以原速返回A地去拿卡．到达A地后，甲忘记卡放在哪里了，花了半个小时找卡．找到卡后，甲又用原速去往B地，结果当乙到达A地时，甲还需要15分钟才能到达B地．那么A、B间的距离是多少千米？
<gadget id="calculator">0.5 * 2</gadget>
<output>1</output>

<gadget id="calculator">15 / 60</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">0.5 - (1/4)</gadget>
<output>0.25</output>

<gadget id="calculator">1 + 0.25</gadget>
<output>1.25</output>

<gadget id="calculator">12.5 - 10</gadget>
<output>2.5</output>

<gadget id="calculator">1.25 / 2.5</gadget>
<output>0.5</output>

<gadget id="calculator">12.5 * 0.5</gadget>
<output>6.25</output>

<gadget id="calculator">10 * 6.25</gadget>
<output>62.5</output>

<result>62.5</result>