Xiaoli's home is 500 meters away from the school. How many kilometers does she have to walk back and forth to school twice a day?
小丽家离学校500米，她每天上学两个来回要走多少千米．
<gadget id="calculator">2 / 1_000</gadget>
<output>1/500 = around 0.002</output>

<gadget id="calculator">500 * 2 * (1/500)</gadget>
<output>2</output>

<result>2</result>