The total number of barrels on each trip=96
amount of quarts per barrel=30
The total amount of barrels picked on each trip will be:
96*30=2,880 quarts
The number of days required to pickup the barrels will be:
[total number of barrels]/[rate]
2880/13
=221.54 hours
but
1 day=24 hours
thus;
221.54 hrs=221.54/24 days=9.23 days