Xiao Ming and Zhang Hua Run the 100 meter race. Xiao Ming reaches the finish 10 meters ahead of time. If Xiao Ming is 10 meters behind the start, who will reach the finish first (Xiao Ming and Zhang Hua have run the 100 meter race for many times, and each time Xiao Ming reaches the finish line 10 meters ahead of time. If Xiao Ming is 10 meters behind the starting point and Zhang Hua is still starting at the starting point, who will reach the finish line first?) (there must be a process of scientific problem solving)

Xiao Ming and Zhang Hua Run the 100 meter race. Xiao Ming reaches the finish 10 meters ahead of time. If Xiao Ming is 10 meters behind the start, who will reach the finish first (Xiao Ming and Zhang Hua have run the 100 meter race for many times, and each time Xiao Ming reaches the finish line 10 meters ahead of time. If Xiao Ming is 10 meters behind the starting point and Zhang Hua is still starting at the starting point, who will reach the finish line first?) (there must be a process of scientific problem solving)

Xiao Ming comes first
If we want to have a scientific problem-solving process, we can only assume that they are uniform
Let Zhang Hua's speed be 10 m / s, then Xiao Ming's speed is (100 / 9) m / s when he reaches the end point
In this way, if Xiao Ming goes back 10 meters, he will run 110 meters, which should take 110 / (100 / 9) s = 990 / 100 = 9.9 s
Zhang Hua still needs 10 seconds

Xiao Ming and Xiao Hua Run the 100 meter race. Each time Xiao Ming reaches the finish line 5 seconds earlier than Xiao Hua. If Xiao Ming moves the starting point back 5 meters from the original starting point,
Xiaohua is still at the starting point. Xiaoming starts at the same time. They are still running at the original average speed
A Xiaoming arrives at the destination first, B Xiaohua arrives at the destination first, C both arrive at the destination at the same time, D condition is not enough to judge

One is the time and the other is the distance. Because I don't know the speed, it's different. So I chose D, hoping to be adopted

The perimeter of the track is 400m. Xiaoming runs 5 / 3 times faster than his grandfather. They start from the same point along the same direction of the track at the same time. Five minutes later, Xiaoming catches up with his grandfather for the first time. Can you calculate their running speed

Xiao Ming ran 400 meters more than his grandfather
Suppose Xiao Ming's grandfather runs V meters per minute
(5/3-1)*v*5=400