The time for six classes is 4 hours, so how many hours is the time for one class? (expressed in fractions)
六节课时间是4小时，那么一节课的时间为多少小时．(用分数表示)
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>