1 .	Two candle of the same height are lighted at the same time. The first is consumed in 3 hours and the second in 1 hour. Assuming that each candidate burnished a constant rate. In how many hours after being lighted, the ratio between the first and second candle becomes 2 : 1?
[ A ]    48 minutes [ B ]    1 hour 36 minutes [ C ]    36 minutes [ D ]    60 minutes
Answer : Option C Explanation :
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