Please help, at it with these graphs again, thanks in advance.

One car is increasing its speed at a steady rate, while another car is decreasing its speed at a steady rate. The speed (y) over time (x) for the cars is represented by the following system of equations.

(picture of graph)

After _[blank A]_ minutes, both cars were traveling at a speed of _[blank B]_ miles per hour.

Enter your answer as the values that correctly fill in the blanks in the previous sentence, in the correct order, and separated by a comma, like this: 42, 53