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Let the time Shelia spend on the road be t. Thus, the time Allison spends on the road will be t-2 (assuming t is at least 2 hours).
Since distance is speed*time, we want the time when the distance Allison and Shelia to be the same:
Therefore, Allison will catch up the Shelia after Shelia is on the road for 8 hours (6 hours driving time for Allison).
Since distance is speed*time, we want the time when the distance Allison and Shelia to be the same:
Therefore, Allison will catch up the Shelia after Shelia is on the road for 8 hours (6 hours driving time for Allison).