Single-order delivery is worth exactly 1,000 won

For example
Restaurant A, Customer A
Restaurant B, Customer B
Customers A and B are likely neighbors
If A orders single-order delivery, cooking is finished at 6:00
If B orders economy delivery, cooking is finished at 6:15
In this case, the rider picks up from B after 6:15,
then picks up from A,
then delivers to Customer A.
While waiting, Food A sits in the shop for 20 minutes before the "fast" delivery.
If lucky, the rider departs immediately after Food A is cooked.
If the rider is delivering in the order B -> A -> B and then accepts Call C,
the order could change to B -> A -> C -> B, making Food B go on a detour.
The worst case is if Food C is a single-order delivery or due to the route,
it becomes B -> A -> C -> C -> B, and Food B is completely ruined.
During peak hours when calls pile up relative to the number of riders,
D can suddenly jump in like B -> A -> C -> D -> C -> D -> B.
I once did delivery for fun, and it took over 30 minutes from picking up B to delivering B. I felt unnecessarily bad about it.