Question 1005182
suppose the distance is 60 miles; it takes him 2 hours.
After 30 miles, half way, averaging 15 mph, he has already been traveling 2 hours.
He can't make the train.

Let x=distance
normal distance is 30 mph*time=x
normal time is x/30, units miles/miles/hour or hours
half way through, or x/2 miles, has taken him x/(2*15) hours.  But that is x/30 hours, so he can't make the train.