and B are walking toward each other from A and B at the same time, and they meet on the way after 4 hours. At this time, A has traveled the entire distance (2/5), and they continue to move forward. When B arrives at A, A What fraction of the whole journey is required to reach point B?
甲、乙两人分别从A、B两地同时相向而行，4小时后在途中相遇，这时甲行了全程的(2/5)，两人继续前进，当乙到达A地时，甲还需行全程的几分之几才可以到达B地？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/5) / (3/5)</gadget>
<output>2/3 = around 0.666667</output>

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

<result>1/3 = around 0.333333</result>