The candles of equal length start burning at the same time. One of the candles takes 5 hours to burn completely whereas the other candle takes 4 hours to burn completely. After burning for certain time, the length of one candle is twice the length of other candle. Find the time the candles have already burned.

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Answers

2016-03-02T16:24:54+05:30
Three hours and forty minutes

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how did u get that?? pls tell me the method or send a photo of it.
2016-03-06T21:16:54+05:30