The average length of Xiaowen's step is 64 centimeters. He walked two laps along the school's circular runway and took a total of 1250 steps. What is the circumference of this circular runway in meters?
小文走一步的平均长度是64厘米，他沿学校的环形跑道走了两圈共走了1250步，这个环形跑道的周长是多少米？
<gadget id="calculator">1_250 / 2</gadget>
<output>625</output>

<gadget id="calculator">64 / 100</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">625 * (16/25)</gadget>
<output>400</output>

<result>400</result>