My sister comes home from school and walks home at a speed of 80 meters per minute. After my sister walks 960 meters, my sister rides a bicycle from school to home at a speed of 240 meters per minute. After a few minutes, can my sister catch up with my sister?
姐姐放学回家，以每分钟80米的速度步行回家，姐姐走了960米后，妹妹骑车以每分钟240米的速度从学校往家中骑，经过几分钟妹妹可追上姐姐？
<gadget id="calculator">240 - 80</gadget>
<output>160</output>

<gadget id="calculator">960 / 160</gadget>
<output>6</output>

<result>6</result>