Xiaogang wants to type a manuscript. He plans to type 3,600 words per hour, and it will take 15 hours to complete it. He actually typed 9,000 words per hour. How many hours will he actually complete the task? (Solution by proportional method)
小刚要打一份书稿，计划每小时打3600个字，要15小时完成，实际每小时打9000个字，实际几小时完成任务？(用比例方法解)
<gadget id="calculator">3_600 * 15</gadget>
<output>54_000</output>

<gadget id="calculator">54_000 / 9_000</gadget>
<output>6</output>

<result>6</result>