You can put this solution on YOUR website! at 7:00 AM joe starts jogging at 6 mi/h. at 7:10 am ken starts off after him. how fast must ken run in order to overtake him at 7:30 AM?
----------------------
Joe has gone 1 mile in 10 minutes, 6 mph for 1/6 hours.
For Ken to make up the mile in 20 minutes, he has to run 3 mph faster than Joe.
Ken has to run 9 mph.