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Time with exactly two candles burning
Middle school · ●●○○○ 20 pts
Three candles can burn for , , and minutes respectively, but they are not lit at the same time. Each candle burns until it is used up. The three candles are burning simultaneously for a total of minutes, and exactly one candle is burning for a total of minutes. Find the total time, in minutes, during which exactly two candles are burning simultaneously.