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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.


Let the lenght be x 
x+2x = 5 +4
3x= 9
x= 3

1 5 1
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