If the earths radius is approximately 3,963 mi, and if a hypothetical perpetual water-making machine pours out

Question:

If the earth’s radius is approximately 3,963 mi, and if a hypothetical perpetual water-making machine pours out 1 gallon in the first minute and then doubles its output each minute, in which minute would this hypothetical machine pour out a single quantity of water that would be enough to fill the earth with water?

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