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Two candles of the same length are lighted at the same time.The first is consumed in 6 hours and the second in 4 hours.Assuming each candle burns at a constant rate,in how many hours after being lighted was the first candle twice the length of the second.

 Jun 21, 2020
 #1
avatar+26635 
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This has been posted before.... try a search to find the answer....

 Jun 21, 2020
 #2
avatar+26635 
+1

Rate x time = distance    (Or amount burned)

rate1   =   1candle/6hr= 1/6

rate 2 =   1 candle/ 4 hours = 1/4

 

amount remaining after x hours = 1 candle - rate * x

 

1- 1/6 *x  = 2 (1- 1/4 * x)

1- 1/6 x = 2 - 1/2 x

1= 2/6 x 

x = 3 hours

 


  ( I couldn't find the other posted answer)

 

3 hrs  x  1/6 =   1/2  Burned  =  1/2 left

3 hrs x1/4 = 3/4       Burned   = 1/4 left 

 Jun 21, 2020

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