A Puzzling Watch
Unreviewed import — a classic from the public domain; its solution has not been machine-checked yet.
math
A friend pulled out his watch and said, "This watch of mine does not keep perfect time; I must have it seen to. I have noticed that the minute hand and the hour hand are exactly together every sixty-five minutes." Does that watch gain or lose, and how much per hour?
Solution
Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.
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