So the speed ratio between Xiao Wang and Uncle is 2:3. Let Xiao Wang's speed be X, then Uncle's speed is 1.5x, so there is an equation.

x + 1.5x = 400/32

The solution is x = 5m/s.

So uncle's speed is 7.5 meters per second.

When chasing in the same direction, the time taken by Uncle's ring is 400÷(7.5-5) = 160 seconds.