A candle burns (3/10) decimeters in (2/3) hours, how many decimeters per hour on average?
一支蜡烛(2/3)小时燃烧(3/10)分米，平均每小时燃烧多少分米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/10) / (2/3)</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>