The runway on the playground is 400 meters long. Xiaohong ran 5 laps. How many kilometers did she run in total?
操场的跑道一圈长400米，小红跑了5圈，她一共跑了多少千米．
<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>