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There are two candles of equal lengths and of different
thickness. The thicker one lasts of six hours. The thinner
2 hours less than the thicker one. Ramesh lights the two
candles at the same time. When he went to bed he saw the
thicker one is twice the length of the thinner one. How
long ago did Ramesh light the two candles .
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Answer Posted / abhijnan dasgupta
let their original lengths be 1 each...let no. of hrs
elapsed since he lighted the candles be x....now since they
are consumed in 6 and 4 hrs respectively their rate of
decrease=1/6 per hr and 1/4 per hr respectively...so we need
(1-x/6)/(1-x/4)=2/1...which gives...x=3 hrs..
| Is This Answer Correct ? | 19 Yes | 8 No |
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