Two-pillar incense problem (Puzzle II)

Title: There are two columns of non-uniform incense, each incense burning up to 1 hours, Q: How to use two-column incense cut out a 15-minute time period?

Tip: The focus of this question is how to cut?

Answer: Will be a point of incense, will be two points of ethyl incense, when ethyl incense burning, the description has been after half an hour, but also said that the incense also just burned half, at this time, the other end of a incense point, from this time up to a full burn of incense, exactly 15 minutes.

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Two-pillar incense problem (Puzzle II)