Xiaohong went to swim in the swimming pool. She swam 2 back and forth in the swimming lane, and swam a total of 48 meters. How long is the swimming lane in this swimming pool?
小红去游泳池游泳，她在泳道内游了2个来回，共游了48米，这个游泳池的泳道有多长？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>