Add the hours and minutes separately, then regroup if minutes exceed 60.

• Hours: 3 h + 1 h = 4 h
• Minutes: 20 min + 45 min = 65 min
• 65 min = 1 h 5 min (since 60 min = 1 h)
• Total: 4 h + 1 h 5 min = 5 h 5 min

Final Answer: 5 h 5 min