Hi everyone, could you please help with the question below?

Activity A has a duration of 5 days and 0 float. Activity B has a duration of 2 days and 3 days of float. Activity C has a duration of 9 days and 0 float . Activity D has a duration of 8 days and 1 day float. What is the total duration of the activites?

Answer says 14 days. I think I've figured it out but would like a bit more insight.

Thanks you,