Li Dayong swam 3 back and forth in the lanes of a swimming pool for a total of 300 meters. How long is the lane of this swimming pool?
李大勇在一个游泳池的泳道里游了3个来回，一共游了300米．这个游泳池的泳道长多少米．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<result>50</result>