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1200gpm
It depends on the flow rate in the hose and that depends on the water pressure.
The capacity of a 25 ft hose with a diameter of 3 inches is 1.23 cubic feet. That is the maximum volume of water in the hose: there need not be any!
There need not be any water at all in the hose! The capacity of the hose is 1.67 cubic feet.
1 Gallon
To find the maximum flow you would need to know the maximum pressure. A typical fire nozzle pressure would be up to 100 psi with a diameter of 1 to 1.25 inches. The GPM would be between 300 GPM and 460 GPM through the nozzle. If it were simply a 3-inch pipe with an oversized pump, running at 100 psi with no nozzle, you could (in theory) move over 3,000 GPM through the pipe (ignoring friction loss). Even at 80 psi, a master stream through a 2-inch nozzle moves over 1,000 GPM.
Weight of 50ft section of 3 inch hose with water in it?
1200gpm
300 GPM
A standard fire hose is 50 feet long. A hose this length with a 2-inch radius grants about 4.36 cubic feet. This volume holds 32 gallons of water.
It depends on the flow rate in the hose and that depends on the water pressure.
None, if the tap is turned off! It depends on the pressure!
12.5
The capacity of a 25 ft hose with a diameter of 3 inches is 1.23 cubic feet. That is the maximum volume of water in the hose: there need not be any!
As much as you want. But a larger quantity will take longer to pass through the hose.
109 lbs with no water
100 pounds with couplings, 68 without.