Jack Frost makes 18 snowballs every hour, but 2 snowballs melt each 15 minutes. How may hours will it take Jack to accumulate 2 dozen snowballs? Express your answer as a decimal to the nearest tenth.
Jack can produce 18-2*60/15= 10 snowballs every hour.
Since 2 dozen = 24,
It takes 2.4 hours until Jack made 2 dozen snowballs.
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