How many kilometers is it to run 20 laps along a 400-meter runway?
沿着400米的跑道跑了20圈是多少千米．
<gadget id="calculator">20 / 1_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">400 * (1/50)</gadget>
<output>8</output>

<result>8</result>