Question 172804
Cutting a log into 5 pieces requires 4 cuts. See the diagram below and imagine the line as the log.

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Assuming that the entire time of cutting the log into pieces is the time to make the cuts, it takes 40 minutes to make 4 cuts or 10 minutes per cut.


To cut the log into 10 pieces requires 9 cuts.

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If each cut takes 10 minutes, it should take 90 minutes.