A and B are practicing long-distance running on a 400-meter circular track, starting from the same point at the same time. A's speed is 6 m/s, and B's speed is 4 m/s. After B runs a few laps, can A surpass B by one lap?
甲、乙两人在400米环形跑道上练习长跑，同时从同一点出发．甲的速度是6米/秒，乙的速度是4米/秒，乙跑几圈后，甲能超过乙一圈？
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">4 / 400</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">400 * 1 * (1/100)</gadget>
<output>4</output>

<result>4</result>