Question 451035
8*(t+.25)=12t
8t+2=12t
2=4t
.5=t half an hour  for the son to catch up.

8*.75=12*.5
6=6
ok
In the 1/4 hour the runner went 2 miles
In the next half hour the runner went 4 miles for a total of 6 miles.
The biker went 6 miles in half an hour