Xiaohua swam 2 back and forth in the swimming pool, and swam a total of 100 meters. How long is the lane of this swimming pool?
小花在游泳池里游了2个来回，共游了100米，这个游泳池泳道有多长？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<result>25</result>