Question

You have two ropes/candels. Each takes exactly 60 minutes to burn. They are made of different material so even though they take the same amount of time to burn, they burn at separate rates. In addition, each rope/candles burns inconsistently. How do you measure out exactly 45 minutes

Answer 1

Hi there!
Here's the answer:

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Given that,
There are 2 ropes/candles

A single rope/candle takes 60 minutes exactly to burn.

If it is lit at both ends, it will take 30 minutes

Now,

Take one rope and burn it at both ends.
At the same time, burn one end of the other rope.

First rope will finish burning after 30 minutes

As soon as first rope/ candle finishes its burning, light the other
end of the remaining rope/candle of second

As 30 minutes is finished, the remaining candle/ rope burns for 30 minutes , but as we now lit the second one at both the ends we will have half of remaining 30 minutes i. e., 15 minutes

( 30 + 15 = 45 )

When this burns out, it shows that 45 minutes have completed.

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:)

Hope it helps