I didn't like this puzzle, for a couple of reasons:
The last shift still happened, despite the fact there was an explosion in the penultimate shift.
The guy doing the penultimate shift is said to have put in the full 8 hours, again, despite a big-ass explosion after 7 hours.
We are supposed to assume that the penultimate guy was the only person to hear the explosion, even though it was an explosion! The last two guys could easily be the other way around, and the guy who talks about hearing it was on last, knew it was an hour before the last shift because he heard an explosion while driving to the place.
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Hi Logan. I know you're reading this.
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