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

Box Plot 1
25 to 35

Box Plot 2
45 to 64

What numbers do I need to subtract?
64-45 and 35-25 and then find the difference between those?
I am somewhat lost.
Please help

4 answers

lacking information

20
45-25=20

whats the second part

i think its 20, i got it right!