Xiao Ming went back and forth twice from home to school, and walked a total of 1000 meters. What is the distance between Xiao Ming's home and school?
小明从家到学校，往返了两次，共走了1000米，小明家到学校的距离是多少米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">1_000 / 4</gadget>
<output>250</output>

<result>250</result>