Two people, A and B, start from A and B at the same time. When A reaches the midpoint of A and B, B is still (1/5) away from the midpoint. When they meet, A has traveled the whole distance.
A、B两人同时从甲乙两地相对出发，当A走到甲乙两地的中点时，B距离中点还有(1/5)的路程，相遇时A行了全程的多少．
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>