Two candles of equal quality and diameter differ by 18 cm in length. They are turned on at the same time and it is observed that at a moment the length of one is 5/2 that of the other. Fifteen minutes later, the smallest one is finished. If the largest candle lasts 3 hours, what was its length? a)120 cm           b)144 cm        c)136 cm          d)N.A

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