How many kilometers is it to run 5 laps along a 400-meter runway?
沿着400米的跑道跑了5圈是多少千米．
<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>