Riddle

Here’s a little riddle for you:

You have two ropes.

They each burn up completely in one hour.  They do not burn at an even rate throughout.  It may take 50 minutes to burn up half of one rope, and 10 minutes to burn up the other half of that same rope. 

Using only a lighter and these two ropes, and lighting both ropes at the same time, how can you tell when 45 minutes has lapsed?

The answer is clever. Check back soon to see it.

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