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There are two candles of equal length and of different thickness. The thicker one when lasts in 6 hours whereas the thinner one lasts 2 hours less than the thicker one. Ramesh lights the two candles at the same time. When he went to bed, he saw that the thicker one is twice the length of the thinner one. How long ago did Ramesh light the two candles?

There are two candles of equal length and of different thickness. The thicker one when lasts in 6 hours whereas the thinner one lasts 2 hours less than the thicker one. Ramesh lights the two candles at the same time. When he went to bed, he saw that the thicker one is twice the length of the thinner one. How long ago did Ramesh light the two candles? Correct Answer 3 hours

Given: 

Lasting time of thicker candle = 6 hours 

Lasting time of thinner candle = 4 hours 

Formula used 

Distance = Speed × Time 

According to the question: 

Let the length of the candles be 1 unit

Let the required time = t 

/ = 2/1

⇒ 1 - t/6 = 2 - t/2

⇒ t/2 - t/6 = 1

⇒ (3t - t)/6 = 1

⇒ t = 3 

∴ Ramesh lit the candles 3 hours ago.

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