Wang Xiaoyan ran back and forth three times along the 100-meter-long runway. How many meters did she run in total?
王小艳沿100米长的跑道跑了3个来回，她一共跑了多少米．
<gadget id="calculator">3 * 2 * 100</gadget>
<output>600</output>

<result>600</result>