The distance from grandpa's house to the park is 500 meters. Grandpa practices running every morning. He has to run two round trips from home to the park. How many kilometers does grandpa run every morning?
爷爷家到公园的距离是500米．爷爷每天早上练习跑步，从家到公园要跑两个来回，爷爷每天早上要跑步多少千米？
<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>