The time for each class in the school is (2/3) hours. In a certain mathematics class, the teacher spent (1/4) hour explaining, and the students spent (1/5) hour doing hands-on operations. The rest of the time, students collaborated and communicated. How much time did the students spend on cooperating and communicating?
学校每节课的时间是(2/3)小时．在某节数学课堂上，老师讲解用了(1/4)小时，同学们动手操作用了(1/5)小时，其余的时间同学们合作交流，同学们合作交流的时间是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(2/3) - (9/20)</gadget>
<output>13/60 = around 0.216667</output>

<result>13/60 = around 0.216667</result>