On a 400-meter-long circular runway, A and B run in the same direction at the same time. A runs 5 meters per second, and B runs 3 meters per second. How many meters before the starting line is the point where the two meet for the first time after starting? ?
在400米长的环形跑道上，甲、乙二人同时同地同向跑步，甲每秒跑5米，乙每秒跑3米，两人起跑后的第一次相遇点在起跑线前多少米？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">200 * 3</gadget>
<output>600</output>

<gadget id="calculator">600 - 400</gadget>
<output>200</output>

<result>200</result>