There is no specific answer. It depends on the water system and the PSI generated. In general the GPM can range from 600GPM to 200GPM and could certainly be lower. Some municipalities color code the hydrants accourding to the GPM produced.
This is a terrible answer to a good question but it just depends.
Lots, but how can you measure it
10 feet
15
The distance is related to the length of a fire hose and the travel path of the tender from the hydrant to the point of fire attack. This could vary but be a normal max of 93m.
4.483 US gallons per minute.
Depends on the fire engine, there are many different sizes and holds many different amounts of water
15 feet
96 gallons per minute = about 363.4 liters per minute.
One cubic foot per minute = 7.481 US gallons per minute.
15
10 feet?
50 gallons of water per minute equals 3,000 gallons per hour.