Kanto Elementary School held a time-limited computer typing competition. If there are several students in Class 6 and 2, the competition task can be completed in 9 minutes. If the Chinese teacher participates in the competition and replaces the next student, and the other students remain unchanged, the competition can be completed 1 minute earlier. For the task, if the math teacher takes part in the competition and replaces another student, the other students remain unchanged, and the task can be completed 1 minute earlier. Now both teachers participate at the same time, and two students are replaced, and the other students remain unchanged, the task can be completed a few minutes earlier Task?
关东小学进行一次限时间电脑打字比赛，六2班若全是若干个学生参赛，则9分钟可完成比赛任务，若语文老师参赛换下一个学生，其他同学都不变，则可提前1分钟完成任务，若数学老师参赛换下一个同学，其他同学都不变，也可提前1分钟完成任务，现在二位老师同时都参加，换下两个学生，其他同学不变，则可提前几分钟完成任务？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) - (1/9)</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">(1/72) * 2</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">(1/9) + (1/36)</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">1 / (5/36)</gadget>
<output>36/5 = around 7.2</output>

<gadget id="calculator">9 - (36/5)</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>