There is a circular runway, A and B start from the same place at the same time in the same direction, when A finishes the third lap and arrives at the starting point, he just catches up with B for the first time. If two people are running 6 meters per second, then A just catches up with B for the first time when A finishes the 7th lap and arrives at the starting point. How many meters did B run per second?
有一圆形跑道，甲、乙二人同时从同一地点沿同一方向出发，当甲跑完第三圈到达出发点时恰好第一次追上乙．如果两个人每秒都快6米，那么甲跑完第7圈到达出发点时恰好第一次追上乙．乙原来每秒跑多少米？
<gadget id="calculator">7 / 6</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">(7/6) * 6</gadget>
<output>7</output>

<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - (7/6)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / (1/3)</gadget>
<output>3</output>

<result>3</result>