In a physical education class, the students spent (2/15) hours doing warm-up activities, and the teacher spent (8/15) hours practicing with the students. How many hours is this class in total?
一节体育课上，同学们做准备活动用了(2/15)小时，老师示范和同学们练习用了(8/15)小时，这节课总共是多少小时？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(2/15) + (8/15)</gadget>
<output>2/3 = around 0.666667</output>

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