and B start running at the same place on a circular runway with a circumference of 200 meters. A runs 6 meters per second, and B runs 4 meters per second. After how many seconds, A runs one more lap than B.
甲、乙两人在周长为200米的圆形跑道的同一地点同时起跑，甲每秒跑6米，乙每秒跑4米，经过多少秒钟，甲比乙多跑一圈．
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>