Because my brother retreated 5 meters, he caught up with his brother when running 100 meters, and his brother was 5 meters away from the finish line.

Because my brother is fast, he also runs 5 meters. My brother was the first to reach the finish line and won. The speed of the younger brother is 95/ 100 of that of the older brother, while 105/ 100 is greater than 100/0.95.

At the same time, speed is proportional to distance.

Distance ratio = speed ratio =100: 95 = 20:19 =1+19.

Now brother 105, brother 100.

105: 100 = 2 1:20 = 1+ 1/20 & lt； 1+ 1/ 19