Wang Hong and Li Ming want to copy the same article. Wang Hong copied 24 characters per minute, and it took 35 minutes to finish. Li Ming transcribes 28 characters per minute, how many minutes can he finish transcribing? (Solve with ratio)
王红和李明要抄写同样一篇文章．王红每分钟抄写24个字，用了35分钟抄写完．李明每分钟抄写28个字，多少分钟可以抄写完？(用比例解)
<gadget id="calculator">24 * 35</gadget>
<output>840</output>

<gadget id="calculator">840 / 28</gadget>
<output>30</output>

<result>30</result>