and B walk toward each other from cities A and B at the same time for 4 hours and then meet on the way. At this time, A has traveled 40% of the whole journey, and the two continue to move forward. When B reaches city A, A still needs to travel the entire distance How much can you reach City B?
甲、乙二人分别从A、B两城同时相向而行4小时后在途中相遇，这时甲行了全程的40%，二人继续前进，当乙到达A城时，甲还需行全程的多少就可以到达B城？
<gadget id="calculator">40 / 100</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>