Given the following question:
45 divided by 2 = 22.5
Since person 1 can write procesdures 2 times faster than person 2 and it usually takes 45 minutes to create one procedure.
We also know it took 2 hours for 2 of person ones procedures
2 + 2 = 4 so we know it isn't option B
Most of the procedures took 45 minutes each but two of them took 2 hours
So we are already up to 2 hours with two procedures
9 - 2 = 7
We are trying to find how much time it takes to complete 9 procedures
7 times 45 (since most procedures took 45 minutes) = 315
60 minutes equals a hour
315 divided by 60 = 5.25
2 + 2 = 4 + 5 = 9
.25 of a hour is 15 minutes
9 hours and 15 minutes your answer is option A