Asked by DIANE

I TRIED WITH X/6 - X/9
IT DIDN'T WORK.

HERE THE PROBLEM:
Two candles are the same length. One candle takes 6 hours to burn all the way down while the other candle takes 9 hours. If the two candles are lit at the same time, how long will it take for the two candles to burn so that one candle is twice the length of the other?
Answered by Steve
If t is in hours,

1 - t/9 = 2(1 - t/6)
1 - t/9 = 2 - t/3
2t/9 = 1
t = 9/2

So, in 4.5 hours, the slow burner has burned halfway, and the fast burner has burned down to 1/4 of its initial height.
Answered by diana
how do u get 2t?
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