A and B are running on a 400-meter-long circular track. They start from the same place and run in opposite directions at the same time. The interval from the first encounter to the second encounter is 40 seconds. A runs 6 meters per second, and B runs 6 meters per second. How many meters did you run?
甲、乙两人在长400米的环形跑道上跑步，他们同时从同一地点出发朝相反方向跑，从第一次相遇到第二次相遇间隔40秒，甲每秒跑6米，乙每秒跑多少米？
<gadget id="calculator">400 / 40</gadget>
<output>10</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<result>4</result>