There is a square orchard. If you walk around the orchard at a speed of 6 kilometers per hour, it takes 2 hours. How many hectares does the orchard cover?
有一个正方形的果园，如果以每小时6千米的速度绕果园步行一周，需要2小时，这个果园占地面积是多少公顷？
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 100</gadget>
<output>900</output>

<result>900</result>