It took Niu Niu about 2 minutes to walk 100 meters, and it took him 12 minutes to walk from his home to the library. How far is his home from the library?
牛牛走100米大约用了2分钟，他从家到图书馆走了12分钟，他家离图书馆大约有多远？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 * 12</gadget>
<output>600</output>

<result>600</result>