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Working with Time in Excel

Working with Time in Excel

Price: FREE

I need to make a worksheet that will track time spent on a certain task. I need to be able to calculate time spent but some times may overlap. For instance:
9:15 - 9:30 15 minutes
9:20 - 11:00 100 unites
9:25 - 10:00 35 minutes
If I add all of these up it would be a total of 150 minutes but since some of them overlapped the actual time spent was 105 minutes.
I hope that makes sense. It seems like it should be fairly simple to do but I just can't seem to make it work.

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