A couple of codebreakers in the popular format. Students should calculate the time described (always simple hours & minutes before/after a given time) to decode the answer to a bad joke.
There are 2 codebreakers - one that deals only in increments of 15 minutes and one that deals in increments of 5 minutes.
I had found plenty of other codebreakers on similar topics but not ones that did specifically what I wanted so hopefully these are of use.
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