They run at least 15 mph
Each individual human is different in their stamina and how long they can go without food. How far you can run really depends on your durability.
It really depends on the human. Gorillas can get up to 25 mph. Your average human can run about 11 mph. However, it is possible for some humans to run as high as 30 mph.
depends if they are fat and if there is food
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.
On average, NBA players run about 3 miles per game.
No human can run 56 miles per hour.
On average, 10+ kilometres
The average human being would normally be able to run it in 11 minutes and 30 seconds.