how do i solve this ? can someone explain step by step how to do it

1) Looking at the plot below, a. Which of the lines represents the reactant A and the product B? b. There are three points on the plot (A, B, and C). Which of these points are at equilibrium? c. At what time (min) does the system reach equilibrium? d. What is [A]eq and [B]eq ? e. If the reaction is 2AB, what is Kc