Learn to tell a running total from a rate of change with parcel deliveries. 120...
https://harperscooldigest.urbanvellum.com/posts/why-do-i-get-parcels-per-hour-instead-of-just-parcels
Learn to tell a running total from a rate of change with parcel deliveries. 120 parcels by noon is a total. 30 parcels per hour is a pace