Xiao Ming swam 4 back and forth in the swimming pool and swam a total of 800 meters. What is the length of the swimming pool in meters?
小明在游泳池游了4个来回，共游了800米，这个游泳池的泳道长是多少米．
<gadget id="calculator">800 / 4 / 2</gadget>
<output>100</output>

<result>100</result>