If john starts works at 8.45am and finish at 5.15pm and has 90 minute of breaks per day how many hours does he work in once weak?

John works from 8:45 AM to 5:15 PM, which totals 8.5 hours. After subtracting 1.5 hours for breaks, he works 7 hours per day. Over a standard 5-day workweek, this amounts to 35 hours of work.