One lap of the school playground is 400 meters, Xiao Ming ran 5 laps around the playground, how many kilometers did he run?
学校操场一圈是400米，小明绕操场跑了5圈，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>