One lap of the runway is 500 meters long. Xiaoyong ran 6 laps. How many kilometers did he run in total?
跑道一圈长500米，小勇跑6圈，共跑了多少千米．
<gadget id="calculator">6 / 1_000</gadget>
<output>3/500 = around 0.006</output>

<gadget id="calculator">500 * (3/500)</gadget>
<output>3</output>

<result>3</result>