Xiao Gang and Xiao Qiang set off from the same spot on the 400-meter circular runway. Xiaogang runs 4.5 meters per second, and Xiaoqiang runs 5.5 meters per second. How many seconds after the start did the two meet for the first time?
小刚和小强在400米的环形跑道上，从同一地点相背出发．小刚每秒跑4.5米，小强每秒跑5.5米，出发后多少秒两人第一次相遇？
<gadget id="calculator">5.5 + 4.5</gadget>
<output>10</output>

<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<result>40</result>