To determine how long it will take for Francesca and Mercedes to arrive at the store, we need to know the duration of their respective paths, which is indicated by the lines shown in the problem. Since the specific information about those paths and their lengths or speeds is not provided in your message, I cannot directly calculate the arrival time.
If you have details about the lengths of their paths or how fast they are traveling, please provide that information, and I will help you calculate the time required for each to reach the store. Otherwise, if you simply want to choose from the options provided, please let me know!