1. The problem is to add two time durations: 6 hours 39 minutes and 2 hours 50 minutes. 2. First, convert the times into hours and minutes separately: 6 hours 39 minutes and 2 hours 50 minutes. 3. Add the hours: $6 + 2 = 8$ hours. 4. Add the minutes: $39 + 50 = 89$ minutes. 5. Since 89 minutes is more than 60 minutes, convert 60 minutes to 1 hour and add this hour to the total hours: $$ 89 \text{ minutes} = 60 \text{ minutes} + 29 \text{ minutes} = 1 \text{ hour} + 29 \text{ minutes} $$ 6. Add 1 hour to the hours total: $8 + 1 = 9$ hours. 7. The remaining minutes are $29$ minutes. 8. Therefore, the total time is $9$ hours and $29$ minutes. **Final answer:** $9$h $29$min