Bao Yuntian swam 6 back and forth in a 55-meter-long swimming pool. How many meters did he swim in total?
鲍云天在一个长55米的游泳池里游了6个来回，他共游了多少米？
<gadget id="calculator">55 * 6 * 2</gadget>
<output>660</output>

<result>660</result>