The circular runway of an elementary school is 400 meters long. Xiao Ming runs an average of 8 meters per second, and Xiao Jun runs an average of 5 meters per second. Now the two start from the starting point at the same time. How long will it take for the two to meet at the starting point?
某小学环形跑道长400米，小明平均每秒跑8米，小军平均每秒跑5米，现在两人同时从起点出发，多长时间后两人在起点相遇？
<result>400</result>