Complex Candle Riddle?

Question

You have two candles that each take precisely one hour to burn completely, but burn a varying rates. How can you use the candles to measure precisely 45 minutes?

Breaking the candles or cutting them does not work because they burn at varying rates, ie, the first half might burn in 5 minutes and the second half in 55 minutes. You can only be sure that when burned to the bottom, it takes one hour each.

Answer 1

Light one candle normally and the other candle at *both* ends. The candle lit on both ends will go out in 30 minutes, regardless of the burn rate from either end. When it goes out, you know that 30 minutes has passed, and that the first candle has 30 minutes remaining. Light the other end of the first candle, which will now only burn 15 additional minutes. When it goes out, 45 minutes will have elapsed.

Answer 2

use a marker to put labels on the 2 candles dividing each one to 4 quarters and light them both at the same time. Because they both burn completely in one hour but in deferent rates (non-linear) then when both candles reach the 3 quarters line make a quick average of both of them to and decide when it is 45 mins, in other words if one reached the line but the other is not wait a bit until the 1st passed the line exactly the same length as the 2nd is away from the line; only then you can say 45 mins had passed.

Answer 3

You could cut the candles into tiny segments and then line them all back up randomly. Then cut off 3/8 of the length and burn it down.

Answer 4

if a candle burns completely in 1 hr, then half the candle burns in 30 mins. and half of the half [one quarter] will burn in 15 mins. so we use just one candle, mark three fourth of the total length. and when it burns upto the mark it is 45 mins.
the other candle is to confuse.

Answer 5

Cut off one quarter of it

Answer 6

some data missing

Answer 7

tell me, I'd like to know....look at a clock?

Answer 8

Use my watch

Answer 9

Time it.....

Answer 10

you cant