To type a manuscript, if you type 90 characters per minute, you can finish typing in 5 minutes. If you need to type in 10 minutes, how many characters per minute do you need to type?
打一份稿件，如果每分钟打90个字，5分钟可打完，如果要10分钟打完，每分钟需要打多少个字？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">90 * (1/2)</gadget>
<output>45</output>

<result>45</result>