A rectangular pasture is 8 kilometers long, and it takes half an hour for Uncle Zhang to drive a car around at a speed of 60 kilometers per hour. How many hectares is the pasture?
一个长方形牧场长8千米，张叔叔开汽车以每小时60千米的速度绕一圈需要半小时，这个牧场的面积是多少公顷？
<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">60 * 0.25</gadget>
<output>15</output>

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

<gadget id="calculator">8 * 7 * 100</gadget>
<output>5_600</output>

<result>5_600</result>