If this junior high school problem can beat the students in Tsinghua.

It is estimated that this student is a student of the middle school attached to Tsinghua University.

100×( 1+ root number 2) meters

elegant

He must be faster than the team.

So when he caught up, he left 100+s meters.

According to the topic, when he returned to the finish line, he should have just walked s meters.

The key to the problem is to find out what s is.

, should be s = 50 * root number 2m.

So the total distance he walked should be100+2s =100 (1+root number 2) meters.