Answer: 7 hours 15 minutes, 6 hours 45 minutes, 5 hours 12 minutes, 6 hours 6 minutes
Step-by-step explanation:
7 1/4 hours = 7 hours + 1/4 × 60 = 7 hours 15 minutes
6 3/4 hours = 6 hours +3/4 × 60 = 6 hrs 45 mins.
5 1/5 hours = 5 hours + 1/5 × 60 = 5 hrs 12 mins.
6 1/10 hours = 6 hours + 1/10 × 60 = 6 hours 10 mins.