First find the number of ounces Erin serves per minute: 10 ounces/bowl * 5 bowls/minute = <<10*5=50>>50 ounces/minute
Then find the number of ounces in the pot: 6 gallons * 128 ounces/gallon = <<6*128=768>>768 ounces
Then divide the total amount of soup by the amount of soup Erin serves per minute: 768 minutes / 50 ounces/minute = <<768/50=15.36>>15.36 minutes, which rounds down to 15 minutes
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