The time elapsed between 5 pm and 11 pm is 6 hours.
The total snowfall during this time is 12 cm - 5 cm = 7 cm.
Therefore, the mean hourly snowfall is:
7 cm ÷ 6 hours = 1 1/6 cm/hour
So the answer in simplest form as a mixed number is 1 1/6.
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