A rectangular forest farm is 8 kilometers long, and it takes 60 minutes for Uncle Li to cycle around at a speed of 500 meters per minute. What is the area of the forest farm in square kilometers?
一个长方形林场长8千米，李叔叔骑自行车以每分钟500米的速度绕一圈需60分钟，这个林场的面积是多少平方千米？
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">500 * 30</gadget>
<output>15_000</output>

<gadget id="calculator">8 * 1_000</gadget>
<output>8_000</output>

<gadget id="calculator">15_000 - 8_000</gadget>
<output>7_000</output>

<gadget id="calculator">7_000 / 1_000</gadget>
<output>7</output>

<gadget id="calculator">8 * 7</gadget>
<output>56</output>

<result>56</result>