A rectangular vegetable field has an area of 68.4 square meters, its width is 7.2 meters, and its length is in meters.
一个长方形菜地，面积是68.4平方米，它的宽是7.2米，长是多少米．
<gadget id="calculator">68.4 / 7.2</gadget>
<output>9.5</output>

<result>9.5</result>