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Two candles start burning at the same time. one candle is 15 cm tall and burn and burns at a rate of 5 cm every

Two candles start burning at the same time. one candle is 15 cm tall and burn and burns at a rate of 5 cm every 6 hours. The other candle is 25 cm tall at a rate of 2 1/2 cm every hour
How tall will the candles be when they first burn down to the same height?

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