3 would be the volume hopes this is good
Assuming that each kind of seat is unnique and different from each other
( assume 4 kinds, premium, gold, silver, bronze, or premium, not premium, not premium, not premium)
so fraciton is parts out of whole so
1 out of 4 toal parts is 1/4
6 hours because
double- 3 hours
triple- 6 hours
The net rate per day is 520 miles per day because 1560 miles divided by 3 days is 520/day. Therefore, we need to see how many days (520 mi) fit into 3640 mi.
3640/520=7
Therefore, it will take 7 days to travel 3640 miles.