At the grocery store, suppose at one register there's one person with 10 items, and at another register there's two people 5 five items each. Obviously the register with only one person in line will be faster because they only have to go through the paying dance once.
But what if the choice is one person with 12 items vs. two people with 5 items each? What if there's two people with 5 each vs. three people with 1 each? What about one with 12 vs. three with 2 each?
In calculating which line is moving fastest, each person who has to pay must create a delay equal to a certain number of items. Someone should do a study and work this out so we can all have efficient queue strategy.
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