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.
single-party
4 kilometers
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.
4 k
16*0.25 = 4km
4 Kilometres
4 (four) miles
not far
nothing
On average, 10+ kilometres
I got 4 kilometers because i converted minutes into hours which then have to do it again with 16 kmhr.