The perimeter of the track is 400m. Xiaoming runs 5 / 3 times faster than his grandfather. They start from the same starting point along the same direction of the track at the same time, Five minutes later, Xiao Ming caught up with his grandfather for the first time and asked about their running speed

The perimeter of the track is 400m. Xiaoming runs 5 / 3 times faster than his grandfather. They start from the same starting point along the same direction of the track at the same time, Five minutes later, Xiao Ming caught up with his grandfather for the first time and asked about their running speed

If grandfather's running speed per minute is x, Xiao Ming is 2 / 3x faster than grandfather
2 / 3 * x * 5 = 400m, x = 120m / min, Xiaoming's speed is 5 / 3 * 120 = 200m / min

A and B walk around a 400 meter runway. If they walk from the same place, they will meet once every two minutes
A and B walk around the 400 meter runway. If they walk from the same place, they will meet once in 2 minutes. If they walk from the same place, they will meet once in 20 minutes. If a is faster than B, they can walk faster

Let a velocity x B velocity y
(X+Y)*2=400
(X-Y)*20=400
X = 110 m / min
Y = 90 m / min

Xiao Ming's and Xiao Gang's are 1200 meters apart. They start from home at the same time. Xiao Ming rides 400 meters in each branch and Xiao Gang walks 60 meters
How far did Xiao Ming go when they met in a few minutes?
There is no requirement for decimal
Thank you o (∩)_ ∩)O!

400x+60x=1200
X = 1200 / 460 = 2.6 (min)
400*2.6=1043.5(m)