A circular track with a total length of 400 meters, Xiaohua insists on running 5 laps every day, how many kilometers does he run every day.
一个环形跑道，全长400米，小华每天坚持跑5圈，每天跑多少千米．
<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">400 * (1/200)</gadget>
<output>2</output>

<result>2</result>