Question 627094
45 seconds: 1 rotation


1 second: 1/45 rotations


60*1 second: 60*(1/45) rotations


60 seconds: 60/45 rotations


60 seconds: 4/3 rotations


1 minute: 4/3 rotations


60*1 minute: 60*(4/3) rotations


60 minutes: 240/3 rotations


60 minutes: 80 rotations


1 hour: 80 rotations


3*1 hour: 3*80 rotations


3 hours: <font color="red">240 rotations</font>


So in 3 hours, it will complete <font color="red">240 rotations</font>


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