Both Lili and Xiaoxiao want to use the weekend to practice writing with a pen. On Saturday, Lili wrote 60, but Xiaoxiao only wrote 15. But Lili can write 8 characters per minute, while Xiaoxiao can write 13 characters per minute. On Sunday, the two had a writing competition together. After a few minutes, they both wrote the same amount?
丽丽和小小都想利用周末练习写钢笔字．星期六时丽丽写了60个，而小小只写了15个．但丽丽每分写8个，而小小每分可写13个字．星期天两人在一块儿比赛写字，几分后两人写得同样多？
<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>