I will show you a way to do 1 and then you pratice with the rest and I'll check it and help you .
This is what I would do to make it easier
1. 7:15 to 11:16 then 12:05 to 6:10
- hours are on the left side-
1 - 7:15 to 8:15
2- 8:15 to 9: 15
3 - 9:15 to 10:15
4 - 10:15 to 11:15
16 - 15 = 1
4 hours and 1 minute
worked :12:05 - 6:10
1- 12:05 to 1:05
2- 1:05 to 2:05
3- 2:05 to 3:05
4 - 3:05 to 4:05
5- 4:05 to 5:05
6- 5:05 to 6:05
10 - 5 = 5
6 hours and 5 mins
4 + 6 = 10 hours
1 + 5 = 6 mins
10 hours and 6 minutes
