Xiao Ming went to the swimming pool to swim. He swam 2 back and forth in the swimming lane, and swam a total of 100 meters. How long is the swimming lane in this swimming pool?
小明去游泳馆游泳，他在泳道内游了2个来回，共游了100米，这个游泳池的泳道有多长？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<result>25</result>