If a lot of 100 units is in a station and it takes 2 minutes per item, [you must show all computations, even very simple

[answerhappygod]

If a lot of 100 units is in a station and it takes 2 minutes per
item, [you must show all computations, even very simple ones!] 1.
how many total minutes is the lot in the station? 2. how many
minutes does each item spend not being processed? 3. If we create a
category called item-minutes, which is each minute spent in the
station by each item, how many total item-minutes are accumulated
while the lot is in the station? 4. how many of the item-minutes
are value added for the lot?