The solution explains how to calculate the combined loading time of two workers based on their individual rates.
To find out how long it takes Mark and Alexis to load packages together, we need to calculate their combined loading rate. Mark can load a truck in 120 minutes, which means he can load 1/120 of the truck in a minute. Similarly, Alexis can load 1/240 of the truck in a minute. When working together, they can load (1/120 + 1/240) of the truck in a minute. Simplifying this gives us 3/240 or 1/80. Therefore, they can load the entire truck together in 80 minutes.
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