Li Nan walked home from school at 64 meters per minute. After walking for 5 minutes, she found that she had forgotten her key in the classroom, and immediately returned to get the key. How many meters did she walk home more than usual?
李楠放学步行回家每分钟走64米，她走了5分钟后，发现钥匙忘在教室了，立即返回取钥匙，她比平时回家多走多少米？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">64 * 10</gadget>
<output>640</output>

<result>640</result>