Xiaoming rides a bike.

After catching up with Xiaoming for the first time, his father left 12km. After catching up with him for the second time, Xiaoming walked 4km. At this time, both of them spent the same time. Let dad's speed be x.

Xiao Ming's speed is y, then

12/x

=

4/ year

Get it

x=3y

At 8: 08 in the morning, Xiaoming set off from home by bike. Eight minutes later, my father came after me on a motorcycle and caught up with Xiaoming 4 kilometers away from home.

, do you understand?

4/x

eight

= 4/ year

There are two formulas that can be obtained.

y= 1/3

x= 1

Then use 8/

y=24

minute

Soon the answer is 8: 32.