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The time to get work is = hours = 1 hour and 20 minutes.
As he arrived at 8:15 am, his starting time was 6:55 am.
Any other answer is WRONG.
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Notice: your post was written in grammatically incorrect way, since you neglect using dots and capital letters, when it is needed.
Also, the form you chose to ask the question, is very unpleasant . . .