How do I find the total working hours of the below driver?
Duty code Dep.Time Arri.Time
A001 03:35 04:20
A001 04:35 05:20
A001 05:51 06:20
A001 06:40 07:20
A001 09:40 10:20
Total Working Hour: 10:20-03:35 = 06:45hrs
Is there a formula to find the total working hours of a single person or a single duty card?

