Let us assume two students must prepare a presentation for their marketing class. As part of their class presentation, they must do a series of...

Let us assume two students must prepare a presentation for their marketing class. As part of their class presentation, they must do a series of calculations and prepare 50 PowerPoint slides. It would take Larry 10 hours to do the required calculation and 10 hours to prepare the slides. It would take Kate 12 hours to do the series of the calculations and 20 hours to prepare the PPT slides.

When figuring the time for the two to split the assignment equally would I a) divide their time by 2 and then add or b) add their time then divide by 2?