We want to increase the CPA of target A to
2 miles.
We hope to come up with a plan and start a course or speed change before 01:12.
First we should plot where the target will be at 01:12 and label it as Mx for point of execution of a course or speed change.
We know the R towards M vector represents 6 minutes of Relative Motion. Simply add another 6 minutes from M to figure where the target will be at 01:12.