pounds of material a day. but whether that material is produced in 24 hours (1,000 pounds an hour), or in 8 hours (3,000 pounds an hour) makes a big difference in rate required for proper system design. in another example, a plant may use 100 pounds of material in a mixture that it makes once an hour, but does that material need to be fed in one hour (100 pounds/hour rate) or one minute (6,000 pounds/hour rate)?
finally the transport itself can be important based on how many people are going. a couple can easily enjoy a road trip in a two seat convertible, but if you are taking two kids 