A lap of the playground runway is 400 meters. Xiao Ming ran 5 laps around the playground. How many kilometers did Xiao Ming run?
操场跑道一圈是400米．小明绕操场跑了5圈．小明跑了多少千米．
<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>