The area of the blackboard is 2.8 square meters, the width is 0.8 meters, and how many meters is the length?
黑板的面积是2.8平方米，宽是0.8米，长是多少米？
<gadget id="calculator">2.8 / 0.8</gadget>
<output>3.5</output>

<result>3.5</result>