The person who lives at the maximum distance, requires maximum time. It is Josh, who lives 15 miles away. He needs 1 hour travel time; hence, he should start first at 12:15.
Depends on who the 1st person you're referring to is!
The 1st person in the problem is Jose. Are you talking about him?
If you're referring to the person who lives farthest away from the park, then that's Josh!