Solution:
Note that:
- 1 day = 24 hours
- 1 hour = 60 minutes
- 1 minute = 60 seconds
10 days = 24 x 10 hours = 60 x 240 minutes = 60 x 60 x 240 seconds
- => 10 days = 864000 seconds
9 hours = 9 x 60 minutes = 9 x 60 x 60 seconds
- => 9 hours = 32400 seconds
Overall time: 864000 + 32400 seconds