The school runway is 400 meters long. Xiao Gang ran 5 laps. How many kilometers did he run?
学校跑道长400米，小刚跑了5圈，他跑了多少千米．
<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>