a person can run miles or even yards far
If the government is run by a single person, sometimes it's called a dictatorship, regardless of the title that the single person assumes.
In order to run for an elective position, a person must be at least 21 years old. The person must also be a citizen of the country in order to qualify.
There is no limit.
A candidate for vice president of the U.S. does not run separately. The VP candidate is selected as a running mate by the candidate for president, and they run as a team. Back in the beginning, they did run separately: the person with the most votes was president, and the one with the second most was vice president. That system didn't last very long; rivals who'd fought for election didn't usually team up too well. (But it could happen within a party!) A VP can run for president later if the person's party selects him or her as the candidate or if the person decides to run independently.
24 miles if you run 10 minute miles at 6 mi/hr
If that's 16 kph, they'll run 4k
That depends on how well conditioned the person is. For the untrained average person, they will not be able to run very far at a full sprint. For a marathon runner (or one who sprints 200 meters, 400 meters, etc.), they will be able to run farther at a full sprint.
16*0.25 = 4km
4 (four) miles
On average, 10+ kilometres