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Sofeopka replied the topic: Distance to commence a descend
Looks okay, I got 23NM but I used E6B computer and rounded the distance 13NM for the distance covered during the descent.
You state cruising level 060. I think levels normally apply above the transition layer. So unless it was FL 600 in the question, but I don't think it was because that would have to come accompanied with a QNH to allow the same datum to be used for correct measuring of vertical distance required to climb or descend.