40 minutes.
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There are 60 minutes in one hour. Therefore, 40 minutes is equal to 2/3 hours, or two thirds of an hour.
1 hour (60 minutes) + 2/3 hour (40 minutes) = 100 minutes
There are 40 minutes in 2/3 hour, diagram or not.
30 minutes equal half an hour.
60 minutes equal one hour.