Puzzle: Candle problem

10815 views 
Sam was studying for his examinations and the lights went off. It was around 1:00 AM. He lighted two uniform candles of equal length but one thicker than the other. The thick candle is supposed to last six hours and the thin one two hours less. When he finally went to sleep, the thick candle was twice as long as the thin one.For how long did Sam study in candle light?
0 Vote Up   |   Post Answer

By  Guest





Sangeeta Haldhar Sangeeta Haldhar   12 years ago

3 hours

Reply    0 Vote Up   0 Vote Up


Gagan Kshirsagar Gagan Kshirsagar   11 years ago

3 hr

Reply    0 Vote Up   0 Vote Up


Sandeep Seth Sandeep Seth   11 years ago

Let rate of burning for thick and thin candle is k1 and k2
then (L - K1 * t) = 2* (L - K2 * t) .... (1)
and K1 = L/6 and K2 = L/4 ... (2)
by solving these two eqns we get T = 3 Hrs.

Reply    0 Vote Up   0 Vote Up