What is the critical path and time duration?

The critical path is A-B-C, with a duration of 15 minutes. You don’t have to be well-versed in computer lingo to figure this one out (as I figured it out without much information on that half of the equation). Here’s how I figured this out.

The first thing I noticed was that the word “predecessor” was used, which means something comes before the other thing. That gave me the first clue that A comes before B and C, and that B must come before C. (Read the question again; A is the predecessor of B and C, but B is also the direct predecessor of C.) Then, I just added the duration times for the three paths, which gave me 15 minutes.