Two people, A and B, start a running race. After starting from the starting point at the same time, when A runs (3/8) of the whole race, B runs (1/3) of the whole race. Afterwards, A's speed remains the same, but B's speed increases, so they reach the finish line at the same time. How much did B's speed increase later?
甲、乙二人进行跑步比赛，同时从起点出发后，当甲跑了全赛程的(3/8)时，乙跑了全赛程的(1/3)．以后甲的速度不变，乙提高了速度，结果二人同时到达终点．问后来乙的速度提高了百分之几？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(5/8) * (1/9) * 8</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(2/3) - (5/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) / (5/9)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>