Stephen can travel 8 miles in 1/2 hour on his bike.
The rate at which Stephen can travel is given by

So, the rate is 16 miles per hour.
If Stephen plans to ride a distance of 16 miles then the required time is

So, it would take Stephen 1 hour.
If it is currently 1:00 P.M then he will arrive at his destination at 1 hour later that is 2:00 P.M