What is the difference in minutes between the shortest collection times before and after the well was installed?

Lower quartile is the median of the lower half
Shortest minutes before well was installed = lower quartile = 48 minutes
Shortest minutes after well was installed = lower quartile = 26 minutes
Difference in minutes between the shortest collection times before and after the well was installed = 48-26 = 22 minutes
The difference in the shortest collection times, which is the minimum values in each box plot = 20.
In a box plot, the minimum value is indicated at the beginning of the whisker to your left.
Thus, the shortest collection time before and after would be the minimum values represented in each box plots given, which are:
Their difference = 45 - 25 = 20
Therefore, the difference in the shortest collection times, which is the minimum values in each box plot = 20.
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