On Sunday, it took (4/5) hours to complete (2/3) of all the homework. If the speed of doing the homework remains the same, how long will it take to do the remaining homework?
星期天，明明用(4/5)小时的时间，完成了全部作业的(2/3)，如果明明做作业的速度不变，剩下的作业，明明还要做多长时间？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/3) / (4/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(1/3) / (5/6)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>