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The Space Shuttle's External Tank carries 383,000 gallons of liquid hydrogen and 143,000 gallons of liquid oxygen to power the Space Shuttle Main Engines. The SSMEs burn for about 8.5 minutes (510 seconds), which means they consuming about 751 gallons of hydrogen per second and 280 gallons of oxygen per second, or about 1031 gallons of propellant overall per second.

As an aside, the Solid Rocket Boosters each carry 1,000,000 pounds of solid propellant (both fuel and oxidizer are combined) and burn for about two minutes. So, that equates to about 16,667 pounds of propellant per second for the SRBs.

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